Tolerate empty role in table multipolygons

Prevent building invalid, partial or incorrect MP in case the outer way has no role (even though this is deprecated, there's still 17035 such ways in MP relations worldwide)

Previously such ways are ignored while building table multipolygons (and except for filtering for `inner` and `outer`, the roles are not actively used while constructing table multipolygons)

analysers/Analyser_Osmosis.py

@@ -135,7 +135,7 @@ class Analyser_Osmosis(Analyser):
             JOIN relation_members ON
                 relation_members.relation_id = relations.id AND
                 relation_members.member_type = 'W' AND
-                relation_members.member_role IN ('outer', 'inner')
+                relation_members.member_role IN ('outer', 'inner', '')
             LEFT JOIN ways ON
                 ways.id = relation_members.member_id
         WHERE