Fixed all members are grayed in global context

idea/src/org/jetbrains/jet/plugin/completion/LookupElementFactory.kt

@@ -207,7 +207,7 @@ public class LookupElementFactory(
         if (receiverTypes == null) return null
         if (descriptor !is CallableMemberDescriptor) return null
 
-        val isReceiverNullable = receiverTypes.all { it.isNullable() }
+        val isReceiverNullable = receiverTypes.isNotEmpty() && receiverTypes.all { it.isNullable() }
         val receiverParameter = descriptor.getExtensionReceiverParameter()
 
         if (receiverParameter != null) {

idea/testData/completion/basic/common/InGlobalPropertyInitializer.kt

@@ -3,4 +3,5 @@ val test = "Hello"
 
 val more = test<caret>
 
-// EXIST: test, testing
+// EXIST: { lookupString: "test", itemText: "test", tailText: " (<root>)", typeText: "String", attributes: "" }
+// EXIST: { lookupString: "testing", itemText: "testing", tailText: " (<root>)", typeText: "Int", attributes: "" }