Fix for Numeric Filter on field with no data

[simon-leech]

A numeric filter on a field that contains no data will currently fail. This is as the response from the template_max and template_min are undefined.

This PR:

1. checks for the response, removing the error,
2. if no response is returned - returns text instead of a slider to tell the user of this.
3. Fixes parseInt to Math.round as values of say 1001.99 would be rounded to 1001 not 1002 previously.

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[RobAndrewHurst]

We will also want to document the filters module! :) @simon-leech Do you want me to give this a crack when you are finished?

[simon-leech]

@RobAndrewHurst Yes please - just fixing the SonarCloud now - then over to you! :)

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

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