fix dictionary referencing

Had an issue with the Constraints object not having a 'Phase' key. The only key in Constraints is 'data' and the corresponding value is a dictionary with the 'Phase' key. Fixed by specifying 'data' key.

Author: dafda1

GSASII/GSASIIscriptable.py

@@ -1391,7 +1391,7 @@ def add_phase(self, phasefile=None, phasename=None, histograms=[],
 
         # process constraints, currently generated only from ISODISTORT CIFs
         if phasereader.Constraints:
-            Constraints = self.data['Constraints']
+            Constraints = self.data['Constraints']['data']
             for i in phasereader.Constraints:
                 if isinstance(i, dict):
                     if '_Explain' not in Constraints: