I have submodules in projects
When I try to see the diff of submodule change in SCM changes of a build, I get "There is a problem" error.

Message: Failed to run command: git show 1e4531be5c3f16d43575b5228f85d4b4845d4488:lib/MSBuildTasks
Command return code: 128
Command error output: fatal: bad object 1e4531be5c3f16d43575b5228f85d4b4845d4488:lib/MSBuildTasks

Root cause:

com.pmease.quickbuild.QuickbuildException: Failed to run command: git show 1e4531be5c3f16d43575b5228f85d4b4845d4488:lib/MSBuildTasks
Command return code: 128
Command error output: fatal: bad object 1e4531be5c3f16d43575b5228f85d4b4845d4488:lib/MSBuildTasks
at com.pmease.quickbuild.execution.Commandline$ExecuteResult.buildException(Commandline.java:516)
at com.pmease.quickbuild.execution.Commandline$ExecuteResult.checkReturnCode(Commandline.java:531)
at com.pmease.quickbuild.plugin.scm.helper.ScmCli.run(ScmCli.java:106)
at com.pmease.quickbuild.plugin.scm.helper.ScmCli.run(ScmCli.java:95)
at com.pmease.quickbuild.plugin.scm.helper.ScmCli.run(ScmCli.java:87)
at com.pmease.quickbuild.plugin.scm.git.GitCli.show(GitCli.java:495)
at com.pmease.quickbuild.plugin.scm.git.GitSourceViewSupport.readSourceByEdition(GitSourceViewSupport.java:52)
at com.pmease.quickbuild.repositorysupport.WorkingDirLocator$SourceViewJob.execute(WorkingDirLocator.java:76)
at com.pmease.quickbuild.grid.NodeJobExecuteJob.execute(NodeJobExecuteJob.java:25)
at com.pmease.quickbuild.grid.GridJob.run(GridJob.java:129)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Steps:
1. Setup config for Git repository with submodules
2. Push a submodule change
3. Run a build.
4. After build completed got to SCM changes. "By file". Click "View" or "Diff" for a submodule change. Observe "There is a problem" the page

I suppose, some kind of result of `git diff --submodule COMMIT-1 COMMIT-2` has to be shown but not the error