execute: support pivot tables without any dimension selected

not sure why, but these changes look working for pivot table without
any dimensions on webpivottable

olapy/core/services/xmla_execute_tools.py

@@ -97,6 +97,11 @@ class XmlaExecuteTools():
                     self.executer.facts]) == 1:
                 # to ignore for tupls in itertools.chain(*tuples)
                 tuples = []
+                #tuples = [ [self.executer.facts] ]
+                #first_att = 2
+                tuples = [[[[self.executer.facts] + [mes] + [mes]]]
+                          for mes in self.executer.selected_measures]
+                first_att = 3
             else:
                 # ['Facts', 'Amount', 'Amount']
                 tuples = [[[[self.executer.facts] + [mes] + [mes]]]
@@ -455,7 +460,7 @@ class XmlaExecuteTools():
         hierarchy_info = ""
         # measure must be written at the top
         if self.executer.facts in mdx_execution_result['columns_desc'][
-                mdx_query_axis].keys() and len(mdx_execution_result[
+                mdx_query_axis].keys() or len(mdx_execution_result[
                     'columns_desc'][mdx_query_axis][self.executer.facts]) > 1:
             hierarchy_info += """
             <HierarchyInfo name="{0}">