Bug: File Transclusion will strip away the first line if there's some spaces

[ickc]

Here is a MWE showing the bug: temp.zip

In the original folder, things are working as expected.

In the bug folder, in file ch1.md, ch2.md, I put 2 spaces in the line between the metadata front matter and the first header. In the transcluded file master.html, you will see that the header of ch1.md, ch2.md has gone.

[fletcher]

So don't put spaces in there. :)

[jasedit]

While I'm no fan of trailing whitespace, I believe I've come up with a minimal fix to avoid whitespace fooling the metadata detection. It fixes the MWE case in my testing