unused imports: don't warn if resolve produces no results but multi resolve does (IDEA-206347)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/unusedImports/UnresolvedReferencesInsideAmbiguousCallToImportedMethod.java

@@ -0,0 +1,6 @@
+import static a.A.foo;
+class Test {
+     {
+          foo(<error descr="Cannot resolve method 'unresolvedMethodCall()'">unresolvedMethodCall</error>());
+     }
+}