More reliable testing of keyword completion (introduced directive "NOTHING_ELSE" instead of "NUMBER")

idea/idea-completion/testData/smartMultiFile/InheritorsAndMultipleExpectedTypes/InheritorsAndMultipleExpectedTypes.kt

@@ -9,4 +9,4 @@ fun bar() {
 // EXIST: { lookupString: "C2", itemText: "C2<X>" }
 // EXIST: { lookupString: "C2", itemText: "C2<Y>" }
 // EXIST: { lookupString: "C3", itemText: "C3" }
-// NUMBER: 7
+// NOTHING_ELSE: true

idea/idea-completion/testData/smartMultiFile/NoObjectDuplication/NoObjectDuplication.kt

@@ -3,4 +3,4 @@ fun foo(): T = <caret>
 // EXIST: foo
 // EXIST: { lookupString: "object", itemText: "object: T{...}" }
 // EXIST: { lookupString: "OO", itemText: "OO", tailText: " (<root>)" }
-// NUMBER: 3
+// NOTHING_ELSE: true