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Cannot clone git project eclipse/che from a Che factory

See original GitHub issue

Description

got this error in the wsagent logs:

2017-10-20 10:12:46,939[io-4401-exec-10]  [ERROR] [c.a.c.r.RuntimeExceptionMapper 46]   - Internal Server Error occurred, error time: 2017-10-20 
10:12:46                                                                                                                                         
java.nio.file.InvalidPathException: Malformed input or input contains unmappable characters: /projects/che/.git/refs/remotes/origin/<D0><A1>HE-5335.lock
       at sun.nio.fs.UnixPath.encode(UnixPath.java:147)                                                                                         
        at sun.nio.fs.UnixPath.<init>(UnixPath.java:71)                                                                                          
        at sun.nio.fs.UnixFileSystem.getPath(UnixFileSystem.java:281)                                                                            
        at java.io.File.toPath(File.java:2234)                                                                                                   
        at org.eclipse.jgit.util.FileUtils.rename(FileUtils.java:261)                                                                            
        at org.eclipse.jgit.internal.storage.file.LockFile.commit(LockFile.java:457)                                                             
        at org.eclipse.jgit.internal.storage.file.RefDirectoryUpdate.doUpdate(RefDirectoryUpdate.java:122)                                       
        at org.eclipse.jgit.lib.RefUpdate$1.execute(RefUpdate.java:517)                                                                          
        at org.eclipse.jgit.lib.RefUpdate.updateImpl(RefUpdate.java:640)                                                                         
        at org.eclipse.jgit.lib.RefUpdate.update(RefUpdate.java:512)                                                                             
        at org.eclipse.jgit.lib.BatchRefUpdate.execute(BatchRefUpdate.java:354)                                                                  
        at org.eclipse.jgit.transport.FetchProcess.executeImp(FetchProcess.java:224)                                                             
        at org.eclipse.jgit.transport.FetchProcess.execute(FetchProcess.java:122)                                                                
        at org.eclipse.jgit.transport.Transport.fetch(Transport.java:1179)                                                                       
        at org.eclipse.jgit.api.FetchCommand.call(FetchCommand.java:128)                                                                         
        at org.eclipse.jgit.api.CloneCommand.fetch(CloneCommand.java:201)                                                                        
        at org.eclipse.jgit.api.CloneCommand.call(CloneCommand.java:135)                                                                         
        at org.eclipse.jgit.api.CloneCommand.call(CloneCommand.java:84)                                                                          
        at org.eclipse.che.git.impl.jgit.JGitConnection.executeRemoteCommand(JGitConnection.java:2121)                                           
        at org.eclipse.che.git.impl.jgit.JGitConnection.clone(JGitConnection.java:595)                                                           
        at org.eclipse.che.api.git.GitProjectImporter.cloneRepository(GitProjectImporter.java:247)                                               
        at org.eclipse.che.api.git.GitProjectImporter.importSources(GitProjectImporter.java:178)                                                 
        at org.eclipse.che.api.project.server.ProjectManager.doImportProject(ProjectManager.java:522)                                            
        at org.eclipse.che.api.project.server.ProjectManager.importProject(ProjectManager.java:486)                                              
        at org.eclipse.che.api.project.server.ProjectService.importProject(ProjectService.java:405)                                              
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)                                                                           
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)                                                         
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

It looks like the branch CHE-5335 is not well encoded. We can find back the branch in Github UI by searching for HE-5335 (without the first C letter) https://github.com/eclipse/che/branches/all?utf8=✓&query=HE-5335