Provide more data about practices that aren't data-matched

[francisbarton]

The creation of full_data involves getting practice data (A) (practice code and patient age data), and then joining that up with the POMI data (B) (practice code, practice name, and patient enabled data).

Currently we do a left_join, so that only POMI data that matches a practice code from A is kept. Some practices in A don't get a match, and are currently excluded from the map.

Two or three job suggestions here:

• Keep details of practices that don't have matching POMI data (show as NA (grey) on map?)
• Check whether there are practices included in POMI that aren't in A (currently no checks for this) - use a full_join instead of left_join?
• Look into whether these can be matched up through a little bit of adjustment (could there even be typos that affect the join?)
• Report the missingness somewhere on the web page