Refactor channel_group_search implementation in tdm_loader

tdm_loader/tdm_loader.py

@@ -190,6 +190,7 @@ def channel_group_search(self, search_term):
             for x in self._root.findall(".//tdm_channelgroup/name")
             if x.text is not None
         ]
+
         search_term = search_term.upper().replace(" ", "")
         found_terms = [
             name
@@ -199,10 +200,11 @@ def channel_group_search(self, search_term):
 
         ind = []
         for name in found_terms:
-            i = chg_names.index(name)
-            ind.append((name, i))
+            for occurence in range(found_terms.count(name)):
+               i = self.channel_group_index(name, occurence)
+               ind.append((name, i))
 
-        return ind
+        return set(ind)
 
     def channel_search(self, search_term):
         """Returns a list of channel names that contain ``search term``.