Strange error message "try at"

[qarmin]

Issue copied from qarmin/czkawka#898 (Op used 0.7.2 version, but with 0.8 same problem happens)

Looks that some pdfs fails to open with strange message try at ... .rs.
Such messages should be clear, but are not.

Example file - Long.Harry.pdf

[s3bk]

This is generated from the t! macro unwrapping an Option.

[s3bk]

https://github.com/pdf-rs/pdf/blob/master/pdf/src/error.rs#L243

[qarmin]

In app I changed this from

Try at /user/pdf.rs:277.rs

into

Decoding error in pdf-rs library -  /user/pdf.rs:277.rs

so maybe same thing could be done directly here?

There is also different error "Shared" which is visible without any context

pdf/pdf/src/error.rs

Lines 14 to 15 in 677152f

	#[snafu(display("Shared"))]
	Shared { source: Arc<PdfError> },

[s3bk]

You can create custom messages for any t! occurence, but i am lazy.