#58 Notes break if they only contain whitespace

[hut]

If a note contains only whitespace, it will use the content of the previous note after saving and reloading the mind map. Steps to reproduce, using 2.3.15:

1. create new mind map
2. add a node named "foo"
3. enter the note editor and insert the text "hello"
4. add another node named "bar"
5. enter the note editor and insert the text " " (or any other combination of spaces and newlines)
6. save the mind map as test.vym
7. open test.vym in a new tab

the note for the node "bar" will have the text "hello" instead of " " or whatever combination of spaces and newlines you used. I hope this is easy for you to fix ;_;

[In Silmaril]

Fixed in 2.3.16