Fix: Better management of pdf generation when tcpdf not available.

htdocs/core/modules/action/rapport.pdf.php

htdocs/core/modules/cheque/pdf/pdf_blochet.class.php

htdocs/core/modules/commande/doc/pdf_einstein.modules.php

...e/modules/expedition/doc/pdf_expedition_merou.modules.php

.../modules/expedition/doc/pdf_expedition_rouget.modules.php

htdocs/core/modules/facture/doc/pdf_crabe.modules.php

htdocs/core/modules/fichinter/doc/pdf_soleil.modules.php

htdocs/core/modules/livraison/pdf/pdf_typhon.modules.php

htdocs/core/modules/project/pdf/pdf_baleine.modules.php

htdocs/core/modules/propale/doc/pdf_azur.modules.php

htdocs/core/modules/rapport/pdf_paiement.class.php

...core/modules/supplier_invoice/pdf/pdf_canelle.modules.php

.../core/modules/supplier_order/pdf/pdf_muscadet.modules.php