Added info message to heuristics.

imagine/pipeline.py

@@ -151,6 +151,8 @@ class Pipeline(Loggable, object):
         # if a parameter value from outside of the cube is requested, return
         # the worst possible likelihood value
         if np.any(cube_content > 1.) or np.any(cube_content < 0.):
+            self.logger.info('Cube %s requested. Returned most negative '
+                             'possible number.')
             return np.nan_to_num(-np.inf)
 
         if rank != 0: