Handle case when there is no db-facts config (#21)

* Add test for empty config

* Handle empty config case

db_facts/db_config.py

@@ -3,7 +3,7 @@
 
 
 def db_config(dbcli_config: DBCLIConfig, db_name: DBName) -> Optional[DBConfig]:
-    dbs = dbcli_config['dbs']
+    dbs = dbcli_config.get('dbs', {})
 
     config_name = "-".join(db_name)
 

metrics/bigfiles_high_water_mark

@@ -1 +1 @@
-326
+337

metrics/coverage_high_water_mark

@@ -1 +1 @@
-97.9100
+97.9200

metrics/mypy_high_water_mark

@@ -1 +1 @@
-72.6500
+72.7300

setup.py

@@ -9,7 +9,7 @@
 import sys
 
 
-VERSION = '3.0.1'
+VERSION = '3.0.2'
 
 
 # From https://circleci.com/blog/continuously-deploying-python-packages-to-pypi-with-circleci/

tests/test_db_info.py

@@ -1,3 +1,4 @@
+import db_facts
 from db_facts.db_info import db
 import unittest
 from unittest.mock import patch
@@ -79,3 +80,13 @@ def test_db_info_two_level_with_one_level_config(self,
             assert_called_with(['frazzle', 'mumble'],
                                mock_dbcli_config['dbs']['frazzle'],
                                mock_dbcli_config)
+
+    def test_db_info_empty_config(self,
+                                  mock_lpass_field,
+                                  mock_db_info_from_lpass,
+                                  mock_pull_jinja_context):
+        mock_pull_jinja_context.return_value = ({}, {})
+        with self.assertRaises(db_facts.errors.UserErrorException) as e:
+            db(['frazzle', 'mumble'], dbcli_config={})
+        self.assertTrue('frazzle-mumble is not a valid DB name' in str(e.exception),
+                        str(e.exception))