JPS JS: simplified the code and added tests for the missing meta.js case (e.g. empty sourceroot; fixed by yole in 00ed0248d9a23701dbef52da02259d174a9999e7)

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

@@ -371,6 +371,11 @@ class KotlinJpsBuildTest : AbstractKotlinJpsBuildTestCase() {
         assertEquals(Collections.EMPTY_SET, contentOfOutputDir(PROJECT_NAME))
     }
 
+    fun testKotlinJavaScriptProjectWithEmptyDependencies() {
+        initProject(JS_STDLIB)
+        makeAll().assertSuccessful()
+    }
+
     fun testKotlinJavaScriptProjectWithTests() {
         initProject(JS_STDLIB)
         makeAll().assertSuccessful()
@@ -387,9 +392,8 @@ class KotlinJpsBuildTest : AbstractKotlinJpsBuildTestCase() {
         buildResult.assertSuccessful()
 
         val warnings = buildResult.getMessages(BuildMessage.Kind.WARNING)
-        assertEquals("Warning about duplicate module definition: $warnings", 2, warnings.size)
+        assertEquals("Warning about duplicate module definition: $warnings", 1, warnings.size)
         assertEquals("Module \"srcAndTests\" is defined in more, than one file", warnings[0].messageText)
-        assertEquals("Module \"srcAndTests\" is defined in more, than one file", warnings[1].messageText)
     }
 
     fun testKotlinJavaScriptProjectWithTwoSrcModuleDependency() {