[Fixed] Load exist XMind raise Error

Tidy xml output that will add extra new line as child node to node. Those new
lines exist as text node and must filter out.

xmind/core/__init__.py

@@ -107,6 +107,9 @@ def getChildNodesByTagName(self, tag_name):
         """
         child_nodes = []
         for node in self._node.childNodes:
+            if node.nodeType == node.TEXT_NODE:
+                continue
+
             if node.tagName == tag_name:
                 child_nodes.append(node)
 

xmind/core/workbook.py

@@ -130,14 +130,15 @@ def __init__(self, node=None, path=None):
         self._path = path
         # Initialize WorkbookDocument to make sure that contains
         # WorkbookElement as root.
-        _workbook_element = self.getChildNodesByTagName(const.TAG_WORKBOOK)
+        _workbook_element = self.getFirstChildNodeByTagName(
+            const.TAG_WORKBOOK)
+
+        self._workbook_element = WorkbookElement(
+            _workbook_element,
+            self)
+
         if not _workbook_element:
-            self._workbook_element = WorkbookElement(ownerWorkbook=self)
             self.appendChild(self._workbook_element)
-        else:
-            self._workbook_element = WorkbookElement(
-                self.documentElement,
-                self)
 
         self.setVersion(const.VERSION)