Channel should be part of kotlinPluginBuild to avoid missing property errors

build/dependencies/gradle.properties

@@ -1,6 +1,5 @@
 # The file might be automatically updated. Comments and empty lines will be removed.
 kotlinPluginBuild=1.2.50-release-IJ2018.2-1
-kotlinPluginChannel=
 jetSignBuild=42.30
 jdkBuild=u152b1248.6
 gradleApiVersion=4.8

build/dependencies/setupKotlin.gradle

@@ -1,18 +1,4 @@
-/*
- * Copyright 2000-2016 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.
- */
+// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 repositories {
   if (project.ext.inJetBrainsNetwork) {
     maven { url 'http://repo.labs.intellij.net/plugins.jetbrains.com' }
@@ -25,7 +11,7 @@ configurations {
 }
 
 dependencies {
-  kotlinPlugin "com.jetbrains.plugins:org.jetbrains.kotlin:$kotlinPluginBuild:$kotlinPluginChannel@zip"
+  kotlinPlugin "com.jetbrains.plugins:org.jetbrains.kotlin:$kotlinPluginBuild@zip"
 }
 
 task setupKotlinPlugin(dependsOn: configurations.kotlinPlugin, type: Sync) {