Handle large json failures

[ryanbrandenburg]

The output files for particularly large or complex repositories can be quite large which can lead to errors like this one:

Error: Cannot create a string longer than 0x1fffffe8 characters
    at Buffer.toString (node:buffer:830:17)
    at JSON.parse (<anonymous>)
    at ScanCodeProcessor._hasRealErrors (/opt/service/providers/process/scancode.js:94:26)

But we don't want that error to obscure the underlying exceptions, so I suggest that we first always log, and then add an extra level of try-catch in _hasRealErrors.