An error appeared when a header has no text but it has properties. For instance:
```org
* A header
:PROPERTIES:
:ID: 7159694c-0e06-41d6-a2fc-1ae3f9ba0321
:END:
* Another header
```
"A header" is processed by `org-gemini-section` and throws error when
exporting: `contents` parameter is nil instead of empty string. "Another
header" is considered a headline and not a section.
An error appeared when a header has no text but it has properties. For instance:
```org
* A header
:PROPERTIES:
:ID: 7159694c-0e06-41d6-a2fc-1ae3f9ba0321
:END:
* Another header
```
"A header" is processed by `org-gemini-section` and throws error when
exporting: `contents` parameter is nil instead of empty string. "Another
header" is considered a headline and not a section.
cnngimenez