Filter out invalid files before contributing them for indexing

#EA-104574

Author: PVTalanov

idea/idea-core/src/org/jetbrains/kotlin/idea/core/script/dependencies/KotlinScriptDependenciesIndexableSetContributor.kt

@@ -25,7 +25,7 @@ class KotlinScriptDependenciesIndexableSetContributor : IndexableSetContributor(
 
  override fun getAdditionalProjectRootsToIndex(project: Project): Set<VirtualFile> {
  val manager = ScriptDependenciesManager.getInstance(project)
- return (manager.getAllScriptsClasspath() + manager.getAllLibrarySources()).toSet()
+ return (manager.getAllScriptsClasspath() + manager.getAllLibrarySources()).filterTo(LinkedHashSet()) { it.isValid }
  }
 
  override fun getAdditionalRootsToIndex(): Set<VirtualFile> = emptySet()