Normalize data type of specLocation to char before adding to blacklist

Author: ehennestad

nwbRead.m

@@ -97,7 +97,7 @@
         'attributes', {{'.specloc', 'object_id'}},...
         'groups', {{}});
     if ~isempty(specLocation)
-        blackList.groups{end+1} = specLocation;
+        blackList.groups{end+1} = char(specLocation);
     end
 
     softLinkWarningResetObj = types.untyped.SoftLink.disablePathDeprecationWarning(); %#ok<NASGU>