Claim 'address' is required in a request - while it only is if no lat/lon is set

[petterreinholdtsen]

When testing a server where only the geo-location (lat/on) is proved for requests the test report this "error":

ERROR: testServiceRequests (main.TestOpen311)

Traceback (most recent call last):
File "open311-validator/test311.py", line 157, in testServiceRequests
self._testServiceRequest(sr)
File "open311-validator/test311.py", line 172, in _testServiceRequest
self.assertTrue(re.search('.+', sr['address']), 'address is required')
KeyError: 'address'

As far as I can see from the spec, the address field is only required if lat/lon is unset.