Show error message when posting an invalid comment

When an internal server error occurs while creating or updating a
comment, display a proper error notification in the UI.

apps/dav/lib/Comments/CommentNode.php

@@ -185,7 +185,7 @@ class CommentNode implements \Sabre\DAV\INode, \Sabre\DAV\IProperties {
 				$msg = 'Message exceeds allowed character limit of ';
 				throw new BadRequest($msg . IComment::MAX_MESSAGE_LENGTH, 0, $e);
 			}
-			return false;
+			throw $e;
 		}
 	}
 

apps/dav/tests/unit/Comments/CommentsNodeTest.php

@@ -166,6 +166,10 @@ class CommentsNodeTest extends \Test\TestCase {
 		$this->assertTrue($this->node->updateComment($msg));
 	}
 
+	/**
+	 * @expectedException Exception
+	 * @expectedExceptionMessage buh!
+	 */
 	public function testUpdateCommentLogException() {
 		$msg = null;
 
@@ -198,7 +202,7 @@ class CommentsNodeTest extends \Test\TestCase {
 		$this->logger->expects($this->once())
 			->method('logException');
 
-		$this->assertFalse($this->node->updateComment($msg));
+		$this->node->updateComment($msg);
 	}
 
 	/**