Empty pdf when exported using main menu

[miciasto]

As raised in the forum by @merlinuwe

Environment

Joplin version: v1.0.178
Platform: Windows 10 + Linux
OS specifcs:

Steps To Reproduce

1. Export note from the menu File > Export > PDF

Expected result: pdf contains note
Observed result: pdf is empty

[miciasto]

Issue #2324 appears to have already existed in 1.0.177 so is probably not related to this bug.