#1083 Font size problem.

[Roger Wolff]

I got the following warning:

Processing: /tmp/fileuyQTHD: PDF document, version 1.7

* Warning: Invalid 0.0 font scale given for Tf *
Press any key to continue...>>showpage, press <return> to continue<<

* This file had errors that were repaired or ignored.
The file was produced by:
* >>>> TCPDF 6.0.062 (http://www.tcpdf.org) <<<<
Please notify the author of the software that produced this
* file that it does not conform to Adobe's published PDF
* specification.

GS>

when rendering a PDF apparently generated by TCPDF.