BaseProcessor without configuration parameter 'connection'

[francescoingv]

Overview

BaseProcessor works also without configuration parameter connection.

Methods add_job() and update_job() are now called subject to the condition the configuration parameter connection is provided.

Additional minor changes: -) in BaseProcessor: improved the error description returned in case of errors during the processing. -) in API: improved returned message if an error is found during the parsing of the json input string -) in echoProcessor: amended returned message in case of wrong input parameter ``

Related Issue / Discussion

Solve #1440

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(as per https://github.com/geopython/pygeoapi/blob/master/CONTRIBUTING.md#contributions-and-licensing)

• [X] I'd like to contribute [feature X|bugfix Y|docs|something else] to pygeoapi. I confirm that my contributions to pygeoapi will be compatible with the pygeoapi license guidelines at the time of contribution.
• [X] I have already previously agreed to the pygeoapi Contributions and Licensing Guidelines

[francescoingv]

The test failed because of the modification of Exception handling in pygeoapi/process/manager/base.py from (line 293):

            outputs = {
                'code': code,
                'description': 'Error updating job'
            }

to (line 296):

            outputs = {
                'code': code,
                'description': str(err)
            }

somehow implementing the note to the Exception: TODO assess correct exception type and description to help users.

I can change back the above line and resubmit the PR, but I would rather suggest to modify the test. Unfortunately I have no experience with testunits, and I cannot make any suggestion/proposal.

[github-actions[bot]]

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