nodes: raise real parse exception

Author: Willi Ballenthin

Evtx/Nodes.py

@@ -1611,8 +1611,7 @@ def string(self):
                 for _ in range(len(frag) // 2):
                     acc.append("<string></string>\n")
             else:
-                # TODO: raise a real exception type here
-                raise RuntimeError("Error parsing uneven substring of NULLs")
+                raise ParseException("Error parsing uneven substring of NULLs")
             bin = bin[len(frag):]
         return "".join(acc)