Commits on Feb 1, 2023

1. Fix gas cost type error …

   - In cases where an IHD is configured for electricity meter only without a gas meter, the gas cost calculations would error
   
   ```
   ...
   in <lambda>
       (js['gasmeter']['energy']['import']['day'] * js['gasmeter']['energy']['import']['price']['unitrate']), 2)
   TypeError: unsupported operand type(s) for *: 'NoneType' and 'NoneType'
   ```
   
   - This was due to the gas values being `null`
   - We now default to `0` for any missing values
   
   Test Plan:
   
   - Manually run the calculation function on the following json sample
   
   ```json
   {
       "gasmeter": {
           "timestamp": "1970-01-01T00:00:00Z",
           "energy": {
               "import": {
                   "cumulative": null,
                   "day": null,
                   "week": null,
                   "month": null,
                   "units": "kWh",
                   "cumulativevol": null,
                   "cumulativevolunits": "",
                   "dayvol": null,
                   "weekvol": null,
                   "monthvol": null,
                   "dayweekmonthvolunits": "",
                   "mprn": "read pending",
                   "supplier": "---",
                   "price": {
                       "unitrate": null,
                       "standingcharge": null
                   }
               }
           }
       }
   }
   ```

   

   kwridan committed Feb 1, 2023
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