Be more tolerant to non-existing paths in library reader. (#1511)

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/library/impl/KonanLibraryReaderImpl.kt

@@ -60,10 +60,11 @@ class LibraryReaderImpl(var libraryFile: File, val currentAbiVersion: Int,
         get() = manifestProperties.propertyString("unique_name")!!
 
     override val bitcodePaths: List<String>
-        get() = (realFiles.kotlinDir.listFiles + realFiles.nativeDir.listFiles).map{it.absolutePath}
+        get() = (realFiles.kotlinDir.listFilesOrEmpty + realFiles.nativeDir.listFilesOrEmpty)
+                .map { it.absolutePath }
 
     override val includedPaths: List<String>
-        get() = (realFiles.includedDir.listFiles).map{it.absolutePath}
+        get() = (realFiles.includedDir.listFilesOrEmpty).map { it.absolutePath }
 
     override val linkerOpts: List<String>
         get() = manifestProperties.propertyList("linkerOpts", target!!.visibleName)

shared/src/main/kotlin/org/jetbrains/kotlin/konan/file/File.kt

@@ -52,6 +52,8 @@ data class File constructor(internal val javaPath: Path) {
         get() = javaPath.isAbsolute()
     val listFiles: List<File>
         get() = Files.newDirectoryStream(javaPath).use { stream -> stream.map { File(it) } }
+    val listFilesOrEmpty: List<File>
+        get() = if (exists) listFiles else emptyList()
 
     fun child(name: String) = File(this, name)