Fix a bug when no "layout" folders exist

plugins/android-idea-plugin/src/org/jetbrains/jet/plugin/android/IDEAndroidResourceManager.kt

@@ -26,6 +26,7 @@ import org.jetbrains.android.facet.AndroidFacet
 import org.jetbrains.jet.lang.resolve.android.AndroidManifest
 import com.intellij.openapi.module.ModuleManager
 import java.util.ArrayList
+import com.intellij.openapi.vfs.VirtualFile
 
 public class IDEAndroidResourceManager(project: Project, searchPath: String?) : AndroidResourceManagerBase(project, searchPath) {
 
@@ -33,10 +34,10 @@ public class IDEAndroidResourceManager(project: Project, searchPath: String?) :
 
     override fun getLayoutXmlFiles(): Collection<PsiFile> {
         try {
-            val facet = getAndroidFacet()
-            return facet.getAllResourceDirectories() flatMap { it.findChild("layout")?.getChildren()!! map { vritualFileToPsi(it)!! } }
+            val directories = getAndroidFacet().getAllResourceDirectories()
+            return directories.flatMap { (it.findChild("layout")?.getChildren() ?: array<VirtualFile>()).map { vritualFileToPsi(it)!! } }
         } catch (e: NoAndroidFacetException) {
-            return ArrayList(0)
+            return listOf()
         }
     }
 

plugins/android-idea-plugin/testData/android/crossParser/nolayout/res/nofiles.txt

@@ -0,0 +1 @@
+Plugin should work even if "layout" directory is missing.

plugins/android-idea-plugin/tests/org/jetbrains/jet/android/CrossParserTestGenerated.java

@@ -60,6 +60,12 @@ public class CrossParserTestGenerated extends AbstractCrossParserTest {
         doTest(fileName);
     }
 
+    @TestMetadata("nolayout")
+    public void testNolayout() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("plugins/android-idea-plugin/testData/android/crossParser/nolayout/");
+        doTest(fileName);
+    }
+
     @TestMetadata("singleFile")
     public void testSingleFile() throws Exception {
         String fileName = JetTestUtils.navigationMetadata("plugins/android-idea-plugin/testData/android/crossParser/singleFile/");