[#730] Make sure 'sort' is always in package_search's data_dict

If data_dict contained no 'sort', the default value was not being added
if the data_dict did contain 'abort_search': True. The code nonetheless
tries to access data_dict['sort'] later on and crashes. (Isn't this what
schemas and validation are supposed to be for?) This was causing a test
to fail. Adding the default 'sort' value to data_dict even if
'abort_search': True is there fixes it.

ckan/logic/action/get.py

@@ -1234,6 +1234,9 @@ def package_search(context, data_dict):
     # the query
     abort = data_dict.get('abort_search',False)
 
+    if data_dict.get('sort') in (None, 'rank'):
+        data_dict['sort'] = 'relevance asc, metadata_modified desc'
+
     results = []
     if not abort:
         # return a list of package ids
@@ -1249,9 +1252,6 @@ def package_search(context, data_dict):
                             if not 'capacity:' in p)
             data_dict['fq'] = fq + ' capacity:"public"'
 
-        if data_dict.get('sort') in (None, 'rank'):
-            data_dict['sort'] = 'relevance asc, metadata_modified desc'
-
         query = search.query_for(model.Package)
         query.run(data_dict)