Gerrit: Fix REST for Gerrit 2.14

2.14 sends JSON without leading closing parentheses.

Change-Id: I51ec44124e6c3f64b3a76733329fe3ea329c60b0
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/git/gerrit/gerritmodel.cpp

@@ -799,6 +799,7 @@ static bool parseOutput(const QSharedPointer<GerritParameters> &parameters,
     } else {
         adaptedOutput = output;
         // Strip first line, which is )]}'
+        if (adaptedOutput.startsWith(')'))
             adaptedOutput.remove(0, adaptedOutput.indexOf("\n"));
     }
     bool res = true;