Merge 70594

WebCore/editing/IndentOutdentCommand.cpp

 /*
  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 112 matching lines @@
     Position start = startOfParagraph(endOfCurrentParagraph).deepEquivalent();
     enclosingCell = enclosingNodeOfType(start, &isTableCell);
     Node* nodeToSplitTo;
     if (enclosingCell)
         nodeToSplitTo = enclosingCell;
     else if (enclosingList(start.node()))
         nodeToSplitTo = enclosingBlock(start.node());
     else
         nodeToSplitTo = editableRootForPosition(start);
 
+    if (!nodeToSplitTo)
+        return;
+
     RefPtr<Node> outerBlock = (start.node() == nodeToSplitTo) ? start.node() : splitTreeToNode(start.node(), nodeToSplitTo);
 
     if (!targetBlockquote) {
         // Create a new blockquote and insert it as a child of the root editable element. We accomplish
         // this by splitting all parents of the current paragraph up to that point.
         targetBlockquote = createIndentBlockquoteElement(document());
         insertNodeBefore(targetBlockquote, outerBlock);
     }
 
     moveParagraphWithClones(startOfParagraph(endOfCurrentParagraph), endOfCurrentParagraph, targetBlockquote.get(), outerBlock.get());
@@ skipping 222 matching lines @@
 
     updateLayout();
     
     RefPtr<Range> startRange = TextIterator::rangeFromLocationAndLength(document()->documentElement(), startIndex, 0, true);
     RefPtr<Range> endRange = TextIterator::rangeFromLocationAndLength(document()->documentElement(), endIndex, 0, true);
     if (startRange && endRange)
         setEndingSelection(VisibleSelection(startRange->startPosition(), endRange->startPosition(), DOWNSTREAM));
 }
 
 }