Open command not working correctly on older versions of Morpho
I discovered a problem with the 'Open' button not working when I first started
Morpho 1.4. Clicking the button several times seems to correct the problem. (The
problem is a null pointer exception in the LocalQuery class.)
Investigation showed that this is a somewhat obscure problem due to having
eml2.0 documents in the local file store (from development of Morpho 1.5). It
turns out that older versions of Morpho throw the exception when hitting a
document in the local file store without a DOCTYPE (i.e. schema based metadata).
Normally, Morpho 1.4 would never save such a document to the local store, but
updating to version 1.5, saving an eml2.0 doc and then using version 1.4 can
result in such cases.