Jonas Jenwald b00835f589 Attempt to improve the PDFDocument error message for empty files (issue 5887)
Given that the error in question is surfaced on the API-side, this patch makes the following changes:
 - Updates the wording such that it'll hopefully be slightly easier for users to understand.
 - Changes the plain `Error` to an `InvalidPDFException` instead, since that should work better with the existing Error handling.
 - Adds a unit-test which loads an empty PDF document (and also improves a pre-existing `InvalidPDFException` message and its test-case).
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