Importing LCM Model creates an invalid resource model in relation null workflows or JSTs

[davhparry]

Comparing the two json docs, it appears the one created by IPCTL strings off any 'null' values, which appears to cause an issue when it's imported.

Exported directly from Ops Manager UI

LDAP Elevated Access Management.json

Created from running ipctl export model
LDAP Elevated Access Management.model.json