`modifyTaskOnTaskwarrior` fails silently

[sternj]

Describe your issue

modifyTaskOnTaskwarrior fails silently when ccsync is enabled and returns a 500 error code. The result of the http.post call is not used.

Steps to reproduce

This follows from the code in api_service.dart

What was the expected result?

An error should somehow be surfaced, perhaps through a toast.

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