`parseDiff` throws exception when these's no diff.

[bunnyc1986]

I am getting exception when the gitDiffText is non-empty but without any changes. For example:

When the gitDiffText is:

Diff between local code and base commit 657e12c36bfbf6029d8067f4d77bd19aee29c4ea (on branch xxx/xxx):
--

I get exception:

[xprazak2]

I encountered this today as well.