Allow setting UEFI/BIOS settings without registry

Bypass the dependency and value checking when no registry is
available to provide that capability.  This allows users contending
with lesser implementations to at least get somewhat further.

Change-Id: I5ac47e42cb6c0e5e2c07ae8c8a68b089e5e2e84a

pyghmi/redfish/command.py

@@ -844,10 +844,10 @@ class Command(object):
 
     def _getsyscfg(self):
         biosinfo = self._do_web_request(self._biosurl, cache=False)
-        reginfo = None
+        reginfo = ({}, {}, {}, {})
         extrainfo = {}
         valtodisplay = {}
-        self.attrdeps = []
+        self.attrdeps = {'Dependencies': [], 'Attributes': []}
         if 'AttributeRegistry' in biosinfo:
             overview = self._do_web_request('/redfish/v1/')
             reglist = overview['Registries']['@odata.id']