Fix bugs identified by trying to use the library
* Refactor MCommGroup.fetch(), mainly to reduce nesting. * Centralize defaulting of list attrs to ; the old code was both overly duplicated and failed to account for some situations. * Most LDAP attributes are not case sensitive, but we were doing a case-sensitive check for the umichGroup object class. * Group display name matching was only casefolding one side of the comparison.
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