Print error when config file can't be parsed

There may not be anything wrong with the API key. In my case, there was
a trailing comma in the last key-value pair in the config file (copied
from your_config_file.cfg). Print out the stacktrace to help track down
the issue to the exact line.

Author: faevourite

cfg/auth.py

@@ -76,10 +76,9 @@ def get_api_key(tileserver):
             data = json.load(json_data_file)
             api_key = data['imagery'][tileserver]
             return api_key
-    except:
-        print("Something is wrong with your API key."
-              "Do you even have an API key?")
-        sys.exit()
+    except Exception:
+        print("Couldn't parse %s as JSON" % CONFIG_PATH)
+        raise
 
 
 # get the import submission_key

cfg/your_config_file.cfg

@@ -15,7 +15,7 @@
 "imagery":{
   "bing": "your_bing_api_key",
   "digital_globe": "your_digital_globe_api_key",
-  "google": "your_google_api_key",
+  "google": "your_google_api_key"
   },
  "slack":{
   "token": "your_slack_token",