Stop removing tables on paste (#2199)

This removes the code that was stripping table elements on paste. They used to cause an exception on paste, but are now working fine.

blocks/api/paste.js

@@ -14,7 +14,6 @@ import { nodetypes } from '@wordpress/utils';
 import { createBlock } from './factory';
 import { getBlockTypes, getUnknownTypeHandler } from './registration';
 import { parseBlockAttributes } from './parser';
-import convertTables from './paste/convert-tables';
 import stripAttributes from './paste/strip-attributes';
 import removeSpans from './paste/remove-spans';
 
@@ -80,7 +79,7 @@ export function normaliseToBlockLevelNodes( nodes ) {
 }
 
 export default function( nodes ) {
-	const prepare = compose( [ normaliseToBlockLevelNodes, removeSpans, stripAttributes, convertTables ] );
+	const prepare = compose( [ normaliseToBlockLevelNodes, removeSpans, stripAttributes ] );
 
 	return prepare( nodes ).map( ( node ) => {
 		const block = getBlockTypes().reduce( ( acc, blockType ) => {

blocks/api/paste/strip-attributes.js

@@ -1,12 +1,16 @@
+import { ELEMENT_NODE } from 'utils/nodetypes';
+
 export default function( nodes ) {
 	// MUTATION!
 	nodes.forEach( deepAttributeStrip );
 	return nodes;
 }
 
 function deepAttributeStrip( node ) {
-	node.removeAttribute( 'style' );
-	node.removeAttribute( 'class' );
-	node.removeAttribute( 'id' );
-	Array.from( node.children ).forEach( deepAttributeStrip );
+	if ( ELEMENT_NODE === node.nodeType ) {
+		node.removeAttribute( 'style' );
+		node.removeAttribute( 'class' );
+		node.removeAttribute( 'id' );
+		Array.from( node.children ).forEach( deepAttributeStrip );
+	}
 }