Fix providers with "bad" plots.

[ImogenConnorHelleur]

Work out why some providers do not plot anything (and return NULL), some will just show the axes, others will just show a horizontal line. Is this to do with the data itself or something in the code? If it is the data; produce an appropriate error message rather than a blank plot.

Without having looked too much at this issue, I don't think that it is because data runs out for certain providers because some plots with this issue will still show the points up until the data runs out (e.g. Ashford Walk in Centre).

[HorridTom]

First step here: define what we mean by a "bad" plot, and identify some motivating examples (Ashford Walk in Centre as above is one such example)

[gabrielburcea]

22/01/2019 - Will check all charts for the following :

1. Country -> England -> National
2. Country -> England -> Regional: London, Midland, North of England, South of England;
3. Country -> England -> Provider Level - first 10 providers( last to be checked is Assura Vertis Urgent Care Centres (Birmingham);

Report the findings: Checked issues 1 and 2 and all are good.

Issue 3:

1st provider - 5 Boroughs Partnership NHS Foundation Trust

• does not reveal variation for all types departments, for Percentage A&E Attendances with time in department < 4h -> yet data seems to be provided.
• a problem: the name of 5 Boroughs Partnership NHS Foundation TRUST has changed - yet Tom noted down this issue; see Provider name changes not reflected in chart titles #32

2nd Provider, 3rd and 4th do not have any issues.

5th provider - Alfred Bean Hospital reveal some issues:

• it has 100 % for A&E Attendances under 4 hours , yet no data displayed for the rest of the dates
• no data displayed for type 1 departments

[derrynlovett]

05/02/2019 - Will check charts for the following :

• plots nothing
• only axes
• just horizontal line

for charts: Country -> England -> Provider Level - 6th to 10th providers

6th provider - Ashford and St Peter's Hospitals NHS Foundation Trust

• No issues 7th provider - Ashford Health Centre
• All dept types
  • Attendance drops to 0 from April 2017 (dept closure?). Data ends after June 2017.
  • Under 4hrs always at 100%
• type 1 dept only
  • No data 8th provider - Ashford Walk-In Centre
• All dept types
  • Under 4hrs always at 100%
• type 1 dept only
  • No data 9th provider - Assura Reading Llp
• All dept types
  • Under 4hrs always at minimal variation around 100%
• type 1 dept only
  • No data 10th provider - Assura Vertis Urgent Care Centres (Birmingham)
• All dept types
  • Under 4hrs always at 100%
• type 1 dept only
  • No data