suppress unresolved reference error under PyImportedModuleType (PY-2075)

python/src/com/jetbrains/python/inspections/PyUnresolvedReferencesInspection.java

@@ -400,7 +400,8 @@ public class PyUnresolvedReferencesInspection extends PyInspection {
             PyType qtype = myTypeEvalContext.getType(qualifier);
             if (qtype != null) {
               if (qtype instanceof PyNoneType || qtype instanceof PyTypeReference ||
-                  (qtype instanceof PyUnionType && ((PyUnionType) qtype).isWeak())) {
+                  (qtype instanceof PyUnionType && ((PyUnionType) qtype).isWeak()) ||
+                  (qtype instanceof PyImportedModuleType)) {
                 // this almost always means that we don't know the type, so don't show an error in this case
                 return;
               }

python/testData/inspections/PyUnresolvedReferencesInspection/unresolvedImportedModule.py

@@ -0,0 +1,2 @@
+import <warning descr="Unresolved reference 'deliverance'">deliverance</warning>.proxycommand
+deliverance.proxycommand.main()

python/testSrc/com/jetbrains/python/inspections/PyUnresolvedReferencesInspectionTest.java

@@ -64,6 +64,10 @@ public class PyUnresolvedReferencesInspectionTest extends PyTestCase {
   public void testTypeAssertions() {
     doTest();
   }
+  
+  public void testUnresolvedImportedModule() {  // PY-2075
+    doTest();
+  }
 
   public void testImportToContainingFile() {  // PY-4372
     myFixture.copyFileToProject("inspections/PyUnresolvedReferencesInspection/__init__.py", "PyUnresolvedReferencesInspection/__init__.py");