1.0dev: Give a better error message when the environment cannot be opened due to not finding `VERSION` or a wrong `VERSION` file.
1.0dev: Give a better error message when the environment cannot be opened due to not finding `VERSION` or a wrong `VERSION` file.

Closes #10408.


git-svn-id: eda3d06fcef731589ace1b284159cead3416df9b@11073 af82e41b-90c4-0310-8c96-b1721e28e2e2

netjunki/trac-Pygit2,jun66j5/trac-ja,walty8/trac,walty8/trac,jun66j5/trac-ja,walty8/trac,jun66j5/trac-ja,netjunki/trac-Pygit2,netjunki/trac-Pygit2,jun66j5/trac-ja,walty8/trac