Fix/metar reading (#354)

* Account for empty ICAO; added tests

* Fix null returns

* Fix typo in volume units display

* Add version field for bug report template

* Some more changes to the bug report template

app/Database/seeds/settings.yml

@@ -60,7 +60,7 @@
   value: gallons
   options: 'gallons,l=liters'
   type: select
-  description: 'The units for fuel for display'
+  description: 'The units of volume for display'
 - key: units.temperature
   name: 'Temperature Units'
   group: units