Post Functions send email with wiki mappings on body doesn't work correctly

Short description: When you create a post function with action send an email and add wiki mappings on the body the email is sent but the body is empty.

Steps to reproduce: 

1. Create a post function with action send an email and add a wiki mapping in the body before another normal mapping (without wiki)
2. Publish the workflow
3. Execute post function

Actual Result: when executing the Post Function, the email is sent but does not print the mappings and data from the body, the body comes empty.

Expected Result: In the body of the email should appear the text.

Note: In attachment is a document with different cases and different behaviors of Xporter - Post functions.