[mtiLib] Set lookup type even if lookup is empty

For real this time.

Lib/fontTools/mtiLib/__init__.py

@@ -817,8 +817,6 @@ def parseLookup(lines, tableTag, font, lookupMap=None):
 	lookup.LookupFlag,filterset = parseLookupFlags(lines)
 	if filterset is not None:
 		lookup.MarkFilteringSet = filterset
-	with lines.until('lookup end'):
-
 	lookup.LookupType, parseLookupSubTable = {
 		'GSUB': {
 			'single':	(1,	parseSingleSubst),
@@ -842,6 +840,7 @@ def parseLookup(lines, tableTag, font, lookupMap=None):
 		},
 	}[tableTag][typ]
 
+	with lines.until('lookup end'):
 		subtables = []
 
 		while lines.peek():