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Path /dev/null not found on Windows

See original GitHub issue

Because path /dev/null is used here, an IOException is thrown (and swallowed) when running the test TkAppTest:rendersOneReport on Windows.

This stack trace is below is written to the output window. The test otherwise passes. All other tests also pass, without outputting any stack traces or other logs.

Futures-1 com.jcabi.log.VerboseCallable: swallowed exception: java.io.IOException: Cannot run program "unzip" (in directory "C:\Users\rok\AppData\Local\Temp\x2864671055049887563\sources\org\jpeek\jpeek"): \dev\null (The system cannot find the file specified)
	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
	at org.jpeek.web.Reports.apply(Reports.java:128)
	at org.jpeek.web.Reports.apply(Reports.java:51)
	at org.jpeek.web.Futures.lambda$apply$0(Futures.java:105)
	at com.jcabi.log.VerboseCallable.call(VerboseCallable.java:179)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at com.jcabi.log.VerboseThreads$Wrap.run(VerboseThreads.java:220)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.FileNotFoundException: \dev\null (The system cannot find the file specified)
	at java.io.FileInputStream.open0(Native Method)
	at java.io.FileInputStream.open(FileInputStream.java:195)
	at java.io.FileInputStream.<init>(FileInputStream.java:138)
	at java.lang.ProcessImpl.start(ProcessImpl.java:112)
	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)