producer_pango_init(): check for null pointer
producer_pango_init(): check for null pointer

Fixes Coverity CID 710868: Dereference before null check (REVERSE_INULL)
Dereferencing pointer "markup". (The dereference is assumed on the basis of the 'nonnull' parameter attribute.)
219                                                strcat( markup, line );
...
Dereferencing pointer "markup". (The dereference is assumed on the basis of the 'nonnull' parameter attribute.)
228                                if ( markup[ strlen( markup ) - 1 ] == '\n' )
229                                        markup[ strlen( markup ) - 1 ] = '\0';
...
Dereferencing "markup" before a null check.
232                                mlt_properties_set( properties, "markup", ( markup == NULL ? "" : markup ) );

j-b-m/mlt,j-b-m/mlt,j-b-m/mlt,mltframework/mlt,anba8005/mlt,siddharudh/mlt,wideioltd/mlt,wideioltd/mlt,zzhhui/mlt,j-b-m/mlt,j-b-m/mlt,xzhavilla/mlt,gmarco/mlt-orig,zzhhui/mlt,siddharudh/mlt,xzhavilla/mlt,wideioltd/mlt,mltframework/mlt,siddharudh/mlt,gmarco/mlt-orig,siddharudh/mlt,zzhhui/mlt,zzhhui/mlt,gmarco/mlt-orig,xzhavilla/mlt,gmarco/mlt-orig,zzhhui/mlt,xzhavilla/mlt,zzhhui/mlt,j-b-m/mlt,j-b-m/mlt,wideioltd/mlt,anba8005/mlt,xzhavilla/mlt,wideioltd/mlt,siddharudh/mlt,anba8005/mlt,zzhhui/mlt,wideioltd/mlt,wideioltd/mlt,mltframework/mlt,siddharudh/mlt,mltframework/mlt,xzhavilla/mlt,wideioltd/mlt,gmarco/mlt-orig,xzhavilla/mlt,j-b-m/mlt,gmarco/mlt-orig,anba8005/mlt,siddharudh/mlt,mltframework/mlt,xzhavilla/mlt,j-b-m/mlt,siddharudh/mlt,gmarco/mlt-orig,anba8005/mlt,anba8005/mlt,anba8005/mlt,anba8005/mlt,zzhhui/mlt,mltframework/mlt,siddharudh/mlt,anba8005/mlt,gmarco/mlt-orig,zzhhui/mlt,gmarco/mlt-orig,j-b-m/mlt,xzhavilla/mlt,mltframework/mlt,mltframework/mlt,mltframework/mlt,mltframework/mlt,wideioltd/mlt