Fix error message to include cause if ResetCommand fails

Bug: 464048
Change-Id: I6e7d9262b94cb168c84faef1dea22c1e082fe5ad
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/api/ResetCommand.java

@@ -227,9 +227,9 @@ public class ResetCommand extends GitCommand<Ref> {
 			setCallable(false);
 			return result;
 		} catch (IOException e) {
-			throw new JGitInternalException(
+			throw new JGitInternalException(MessageFormat.format(
 					JGitText.get().exceptionCaughtDuringExecutionOfResetCommand,
-					e);
+					e.getMessage()), e);
 		}
 	}