Configuration: Add non-release repository to main Gradle buildfile

#KT-24725 Fixed

idea/idea-gradle/src/org/jetbrains/kotlin/idea/configuration/GroovyBuildScriptManipulator.kt

@@ -78,7 +78,6 @@ class GroovyBuildScriptManipulator(
                         }
                     }
                 }
-                addMavenCentralIfMissing()
             }
         }
         else {
@@ -97,11 +96,11 @@ class GroovyBuildScriptManipulator(
                     }
                 }
             }
+        }
 
-            scriptFile.getRepositoriesBlock().apply {
-                addRepository(version)
-                addMavenCentralIfMissing()
-            }
+        scriptFile.getRepositoriesBlock().apply {
+            addRepository(version)
+            addMavenCentralIfMissing()
         }
 
         scriptFile.getDependenciesBlock().apply {

idea/idea-gradle/src/org/jetbrains/kotlin/idea/configuration/KotlinBuildScriptManipulator.kt

@@ -85,16 +85,15 @@ class KotlinBuildScriptManipulator(
                             }
                         }
                     }
-                    addMavenCentralIfMissing()
                 }
             } else {
                 script?.blockExpression?.addDeclarationIfMissing("val $GSK_KOTLIN_VERSION_PROPERTY_NAME: String by extra", true)
                 getApplyBlock()?.createPluginIfMissing(kotlinPluginName)
                 getDependenciesBlock()?.addCompileStdlibIfMissing(stdlibArtifactName)
-                getRepositoriesBlock()?.apply {
-                    addRepositoryIfMissing(version)
-                    addMavenCentralIfMissing()
-                }
+            }
+            getRepositoriesBlock()?.apply {
+                addRepositoryIfMissing(version)
+                addMavenCentralIfMissing()
             }
             jvmTarget?.let {
                 changeKotlinTaskParameter("jvmTarget", it, forTests = false)

idea/idea-gradle/tests/org/jetbrains/kotlin/idea/codeInsight/gradle/GradleConfiguratorTest.kt

@@ -526,6 +526,9 @@ class GradleConfiguratorTest : GradleImportingTestCase() {
 
                             repositories {
                                 mavenCentral()
+                                maven {
+                                    url 'http://dl.bintray.com/kotlin/kotlin-eap'
+                                }
                             }
 
                             dependencies {
@@ -615,6 +618,7 @@ class GradleConfiguratorTest : GradleImportingTestCase() {
 
                             repositories {
                                 mavenCentral()
+                                maven { setUrl("http://dl.bintray.com/kotlin/kotlin-eap") }
                             }
 
                             dependencies {
@@ -814,6 +818,9 @@ class GradleConfiguratorTest : GradleImportingTestCase() {
 
                             repositories {
                                 mavenCentral()
+                                maven {
+                                    url 'http://dl.bintray.com/kotlin/kotlin-eap'
+                                }
                             }
                             dependencies {
                                 compile "org.jetbrains.kotlin:kotlin-stdlib-js"
@@ -882,6 +889,7 @@ class GradleConfiguratorTest : GradleImportingTestCase() {
 
                             repositories {
                                 mavenCentral()
+                                maven { setUrl("http://dl.bintray.com/kotlin/kotlin-eap") }
                             }
                             dependencies {
                                 compile(kotlin("stdlib-js"))