static CommonResults should be returned when the available results couldn't be accessed (#135)

Author: cbellot000

ansys/dpf/core/model.py

@@ -155,6 +155,8 @@ def results(self):
             if misc.DYNAMIC_RESULTS:
                 try:
                     self._results = Results(self)
+                    if len(self._results) == 0:
+                        self._results = CommonResults(self)
                 except Exception as e:
                     self._results = CommonResults(self)
                     LOG.debug(str(e))