Fix an issue in the parse call.

jedi/parser/python/diff.py

@@ -206,10 +206,6 @@ class DiffParser(object):
         debug.speed('diff parser calculated')
         debug.dbg('diff: line_lengths old: %s, new: %s' % (len(lines_old), line_length))
 
-        if len(opcodes) == 1 and opcodes[0][0] == 'equal':
-            self._copy_count = 1
-            return self._module
-
         for operation, i1, i2, j1, j2 in opcodes:
             debug.dbg('diff %s old[%s:%s] new[%s:%s]',
                       operation, i1 + 1, i2, j1 + 1, j2)