Fix #2930. Do not require entity applicability in IfcTester.

src/ifctester/ifctester/ids.py

@@ -201,7 +201,13 @@ class Specification:
             return
 
         elements = []
-        for facet in self.applicability:
+        for i, facet in enumerate(self.applicability):
+            # Usually, we rely on an entity applicability to give us our first
+            # shortlist of elements, as it's the most efficient way to filter
+            # elements. If this does not exist, then we have no choice but to
+            # check everything.
+            if i == 0 and not isinstance(facet, Entity):
+                elements = list(ifc_file)
             elements = facet.filter(ifc_file, elements)
 
         for element in elements: