✨ [Device Management] - API to upload a JSON snapshot fragment returns 204 if the fragment is not in Kapua snapshot format

[Agnul97]

before this PR, you had this bug:

1. Connect an ESF device to EC

2. Download a JSON snapshot from the connected device directly from the Web UI of ESF (see attachment)

3. Upload such snapshot to ESF using the rest-API

4. The rest-api returns 204

Expected Result

The error should be 400 - Bad request

Here I fixed the issue adding a check for the presence of at least 1 component configuration inside the deviceConfiguration passed via rest-api

[codecov-commenter]

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Codecov Report

:x: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...rnal/DeviceConfigurationManagementServiceImpl.java	0.00%	2 Missing :warning:

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