Dump DATA_LENGTH_0 in RSTXCPDF, form CONT_ADD_STRING

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Symptom
During the conversion of SAPscript or Smart Forms to PDF, an ABAP short dump
DATA_LENGTH_0
occurs in the report RSTXCPDF, form PDF_CONT_ADD_STRING.
The affected line is:
pdf_stream_l+1(strlen) = string_c.
The variable strlen has the value 0.
Other terms
CONVERT_OTF, RSTXPDFT4, PDF1
Reason and Prerequisites
The reason for this is a character code in the OTF text data, which cannot be converted.
For example: Code page [...]