Merge pull request #369 from ConnectedSystems/develop

Revert earlier commit to re-enable handling of multi-output results

src/SALib/util/problem.py

@@ -250,10 +250,13 @@ def analyze(self, func, *args, **kwargs):
     def to_df(self):
         """Convert results to Pandas DataFrame."""
         an_res = self._analysis
-        if an_res is None:
-            raise RuntimeError("Analysis not yet conducted")
-
-        return an_res.to_df()
+        if isinstance(an_res, ResultDict):
+            return an_res.to_df()
+        elif isinstance(an_res, dict):
+            # case where analysis result is a dict of ResultDicts
+            return [an.to_df() for an in list(an_res.values())]
+
+        raise RuntimeError("Analysis not yet conducted")
 
     def plot(self):
         """Plot results"""