Errors in MusicXML files created with MuseScore 2.0 RC

I exported some scores as MusicXML files using MuseScore 2.0 RC.

When I tried to open them using Finale 2014d, I got dozens of errors such as this:

XML error in file 01_Introitus.xml at line 447:
The content of element type "lyric" is incomplete, it must match
"((((syllabic?,text),(elision?,syllabic?,text)*,extend?)|extend|laughing|humming),end-line?,end-paragraph?,(footnote?,level?)).

Apparently, the errors occur when the element text is missing from blocks of code such as this:

<lyric number="1">
<syllabic>single</syllabic>
</lyric>

Indeed, I could circumvent the errors by modifying the code as follows:

<lyric number="1">
<syllabic>single</syllabic>
<text/>
</lyric>

But I am not sure if by doing so I compromised the scores' integrity.

Anyway, this looks like a bug.

P.S.: The scores in question come from the page:
http://www.cafe-puccini.dk/Mozart_Requiem.aspx
For example:
01_Introitus.mscx