pylint: fix 'used before assignment'

Signed-off-by: Tucker Polomik <t.polomik@cablelabs.com>

main.py

@@ -707,6 +707,7 @@ def update_transition_dropdown_menus(_, _type):
     """
     placeholder = 'Select a new BSSID'
     avail_stations = [sta.get_mac() for sta in get_topology().get_stations()]
+    avail_targets  = []
     if _type is None or _type == 'Client Steering':
         avail_targets = [bss.get_bssid() for bss in get_topology().get_bsses()]
     elif _type == 'VBSS':

nbapi.py

@@ -36,6 +36,7 @@ def marshall_nbapi_blob(nbapi_json) -> Topology:
 
     agent_dict: Dict[str, Agent] = {}
     iface_dict: Dict[str, Interface] = {}
+    controller_id: str = ''
 
     for entry in nbapi_json:
         path = entry['path']