This includes a check to see if there are 0 pages in the combined pdf,
catching exceptions and suppressing php warnings and errors from bad pdf files.
Also - Use TCPDF directly to check if pdfs are compatible. The previous check was
letting dodgy PDFs through which then failed at generation time. This way dodgy
pdfs will get run through ghostscript early and cleaned up.
It was possible for user to add widgets with width/height = 0
which were not displayed to user and doesn't have much meaning to it
This patch will set min. width/height to 1
Adam Olley