Fix invalid json error handling

[varmar05]

Fix the parsing error issue if response was not json type (eg. proxied request) or invalid json body.

[coveralls]

Coverage Report for CI Build 25547627286

Coverage decreased (-0.07%) to 93.142%

Details

• Coverage decreased (-0.07%) from the base build.
• Patch coverage: 3 of 3 lines across 1 file are fully covered (100%).
• 28 coverage regressions across 2 files.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

28 previously-covered lines in 2 files lost coverage.

File	Lines Losing Coverage	Coverage
server/mergin/sync/storages/disk.py	26	82.47%
server/mergin/tests/test_disk_utils.py	2	96.23%

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Coverage Stats

Relevant Lines:	9813
Covered Lines:	9140
Line Coverage:	93.14%
Coverage Strength:	0.93 hits per line

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💛 - Coveralls