Empty 7bit email results in odd characters

Prior to this fix, if a MIME email from an external source with 7bit encoding and no content was processed by Crossware Mail Signature. The signature was appended but contained garbage characters.

Example of source email:

image-20251107-015833.png

Example when processed:

image-20251107-015850.png

Same email processed with fix:

image-20251107-015910.png

This issue was resolved in V4.01