Don't highlight scripts if resolver returns Failure.

Note that we don't highlight script when ScriptDependenciesFileAttribute is not set.

idea/idea-gradle/src/org/jetbrains/kotlin/idea/core/script/GradleScriptTemplateProvider.kt

@@ -88,8 +88,6 @@ class GradleScriptDefinitionsContributor(private val project: Project) : ScriptD
         return loadDefinitions()
     }
 
-    override fun isError() = failedToLoad.get()
-
     // NOTE: control flow here depends on suppressing exceptions from loadGradleTemplates calls
     // TODO: possibly combine exceptions from every loadGradleTemplates call, be mindful of KT-19276
     private fun loadDefinitions(): List<KotlinScriptDefinition> {