JPS: completely skip chunk containing only dummy targets

Such chunks were added in intellij-community, see
commit fdeae7754c593e78b6748dfa66ce7198c2780d35
(https://github.com/JetBrains/intellij-community/commit/fdeae7754c593e78b6748dfa66ce7198c2780d35)

Original commit: 99439620d4

jps/jps-plugin/jps-tests/test/org/jetbrains/kotlin/jps/build/AbstractIncrementalJpsTest.kt

@@ -435,7 +435,7 @@ abstract class AbstractIncrementalJpsTest(
         }
 
         override fun buildStarted(context: CompileContext, chunk: ModuleChunk) {
-            if (context.projectDescriptor.project.modules.size > 1) {
+            if (!chunk.isDummy(context) && context.projectDescriptor.project.modules.size > 1) {
                 logLine("Building ${chunk.modules.sortedBy { it.name }.joinToString { it.name }}")
             }
         }

jps/jps-plugin/src/org/jetbrains/kotlin/jps/build/KotlinBuilder.kt

@@ -121,6 +121,8 @@ class KotlinBuilder : ModuleLevelBuilder(BuilderCategory.SOURCE_PROCESSOR) {
     override fun chunkBuildStarted(context: CompileContext, chunk: ModuleChunk) {
         super.chunkBuildStarted(context, chunk)
 
+        if (chunk.isDummy(context)) return
+
         context.testingContext?.buildLogger?.buildStarted(context, chunk)
 
         if (JavaBuilderUtil.isForcedRecompilationAllJavaModules(context)) return
@@ -178,9 +180,11 @@ class KotlinBuilder : ModuleLevelBuilder(BuilderCategory.SOURCE_PROCESSOR) {
         applyActionsOnCacheVersionChange(actions, cacheVersionsProvider, context, dataManager, targets, fsOperations)
     }
 
-    override fun chunkBuildFinished(context: CompileContext?, chunk: ModuleChunk?) {
+    override fun chunkBuildFinished(context: CompileContext, chunk: ModuleChunk) {
         super.chunkBuildFinished(context, chunk)
 
+        if (chunk.isDummy(context)) return
+
         LOG.debug("------------------------------------------")
     }
 
@@ -190,6 +194,8 @@ class KotlinBuilder : ModuleLevelBuilder(BuilderCategory.SOURCE_PROCESSOR) {
             dirtyFilesHolder: DirtyFilesHolder<JavaSourceRootDescriptor, ModuleBuildTarget>,
             outputConsumer: ModuleLevelBuilder.OutputConsumer
     ): ModuleLevelBuilder.ExitCode {
+        if (chunk.isDummy(context)) return NOTHING_DONE
+
         val messageCollector = MessageCollectorAdapter(context)
         val fsOperations = FSOperationsHelper(context, chunk, LOG)
 

jps/jps-plugin/src/org/jetbrains/kotlin/jps/build/jpsUtil.kt

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2010-2017 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.jps.build
+
+import org.jetbrains.jps.ModuleChunk
+import org.jetbrains.jps.incremental.CompileContext
+
+fun ModuleChunk.isDummy(context: CompileContext): Boolean {
+    val targetIndex = context.projectDescriptor.buildTargetIndex
+    return targets.all { targetIndex.isDummy(it) }
+}