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pitest fails to execute on projects that don't have test classes

See original GitHub issue

For example running pitest on xwiki-commons-core (https://github.com/xwiki/xwiki-commons/tree/master/xwiki-commons-core) with the following configuration:

      <plugin>
        <groupId>org.pitest</groupId>
        <artifactId>pitest-maven</artifactId>
        <version>1.1.10</version>
        <configuration>
          <targetClasses>
            <param>org.xwiki*</param>
          </targetClasses>
          <targetTests>
            <param>org.xwiki*</param>
          </targetTests>
        </configuration>
      </plugin>

Leads to:

[ERROR] Failed to execute goal org.pitest:pitest-maven:1.1.10:mutationCoverage (default-cli) on project xwiki-commons-stability: Execution default-cli of goal org.pitest:pitest-maven:1.1.10:mutationCoverage failed: No test library found on classpath. PIT requires either JUnit 4 (but can run JUnit 3 tests) or TestNG
[ERROR] See http://pitest.org for more details.
[ERROR] -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.pitest:pitest-maven:1.1.10:mutationCoverage (default-cli) on project xwiki-commons-stability: Execution default-cli of goal org.pitest:pitest-maven:1.1.10:mutationCoverage failed: No test library found on classpath. PIT requires either JUnit 4 (but can run JUnit 3 tests) or TestNG
See http://pitest.org for more details.
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
	at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-cli of goal org.pitest:pitest-maven:1.1.10:mutationCoverage failed: No test library found on classpath. PIT requires either JUnit 4 (but can run JUnit 3 tests) or TestNG
See http://pitest.org for more details.
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:145)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
	... 20 more
Caused by: org.pitest.help.PitHelpError: No test library found on classpath. PIT requires either JUnit 4 (but can run JUnit 3 tests) or TestNG
See http://pitest.org for more details.
	at org.pitest.mutationtest.config.ConfigurationFactory.createConfiguration(ConfigurationFactory.java:56)
	at org.pitest.mutationtest.config.LegacyTestFrameworkPlugin.createTestFrameworkConfiguration(LegacyTestFrameworkPlugin.java:36)
	at org.pitest.mutationtest.config.SettingsFactory.getTestFrameworkPlugin(SettingsFactory.java:132)
	at org.pitest.mutationtest.config.SettingsFactory.createCoverageOptions(SettingsFactory.java:140)
	at org.pitest.mutationtest.tooling.EntryPoint.execute(EntryPoint.java:80)
	at org.pitest.mutationtest.tooling.EntryPoint.execute(EntryPoint.java:45)
	at org.pitest.maven.RunPitStrategy.execute(RunPitStrategy.java:35)
	at org.pitest.maven.AbstractPitMojo.analyse(AbstractPitMojo.java:398)
	at org.pitest.maven.AbstractPitMojo.execute(AbstractPitMojo.java:342)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
	... 21 more
[ERROR]

Note: The xwiki-commons-stability maven project doesn’t have any test (and thus doesn’t depend on junit).