Do not create empty connections list (#1178)

This should fix (1) from #1139 (comment), by preventing us from sending an empty connections element if the list of connections is empty.

Author: jacalata

tableauserverclient/server/request_factory.py

@@ -182,10 +182,10 @@ def _generate_xml(self, datasource_item, connection_credentials=None, connection
         if connection_credentials is not None and connections is not None:
             raise RuntimeError("You cannot set both `connections` and `connection_credentials`")
 
-        if connection_credentials is not None:
+        if connection_credentials is not None and connection_credentials != False:
             _add_credentials_element(datasource_element, connection_credentials)
 
-        if connections is not None and len(connections) > 0:
+        if connections is not None and connections != False and len(connections) > 0:
             connections_element = ET.SubElement(datasource_element, "connections")
             for connection in connections:
                 _add_connections_element(connections_element, connection)
@@ -337,7 +337,7 @@ def _generate_xml(self, flow_item: "FlowItem", connections: Optional[List["Conne
         project_element = ET.SubElement(flow_element, "project")
         project_element.attrib["id"] = flow_item.project_id
 
-        if connections is not None:
+        if connections is not None and connections != False:
             connections_element = ET.SubElement(flow_element, "connections")
             for connection in connections:
                 _add_connections_element(connections_element, connection)
@@ -904,10 +904,10 @@ def _generate_xml(
         if connection_credentials is not None and connections is not None:
             raise RuntimeError("You cannot set both `connections` and `connection_credentials`")
 
-        if connection_credentials is not None:
+        if connection_credentials is not None and connection_credentials != False:
             _add_credentials_element(workbook_element, connection_credentials)
 
-        if connections is not None and len(connections) > 0:
+        if connections is not None and connections != False and len(connections) > 0:
             connections_element = ET.SubElement(workbook_element, "connections")
             for connection in connections:
                 _add_connections_element(connections_element, connection)