fix: More fool-proof error message handling

[RobQuistNL]

Proposed Changes

Changes the error thrown from something like this;

ErrorException
Undefined property: stdClass::$message

to something like this;

InfluxDB2\ApiException 
[500] Error connecting to the API (http://influxdb:8086/api/v2/query?org=-)(type error 1:35-1:76: function does not take a parameter "end", required params (start))

Checklist

• [x] CHANGELOG.md updated
• [x] Rebased/mergeable
• [x] A test has been added if appropriate
• [x] make test completes successfully
• [x] Commit messages are conventional
• [x] Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 75.09%. Comparing base (443c62c) to head (c829a1b).

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #155 +/- ## ============================================ + Coverage 75.00% 75.09% +0.09% - Complexity 432 433 +1 ============================================ Files 25 25 Lines 1100 1104 +4 ============================================ + Hits 825 829 +4 Misses 275 275 ```

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[RobQuistNL]

Thanks @bednar :)

I think I did all those things. Maybe best to add these requirements into the Contributing section or in a CONTRIBUTING.md file so in the future people spot it easier up front.

Thanks for reviewing so promptly!