Only apply fabric plugin if fabric key is found

app/build.gradle

+buildscript {
+    repositories {
+        maven { url 'https://maven.fabric.io/public' }
+    }
+
+    dependencies {
+        classpath 'io.fabric.tools:gradle:1.21.7'
+    }
+}
+
+repositories {
+    maven { url 'https://maven.fabric.io/public' }
+}
+
 apply plugin: 'com.android.application'
-apply plugin: 'io.fabric'
 apply plugin: 'com.neenbedankt.android-apt'
+if (project.hasProperty("LABCOAT_FABRIC_KEY")) {
+    System.out.println("Has fabric key. Enabling fabric plugin")
+    apply plugin: 'io.fabric'
+} else {
+    System.out.println("No fabric key found. Disabling fabric plugin")
+}
 def versionMajor = 2
 def versionMinor = 2

build.gradle

@@ -3,21 +3,18 @@ apply plugin: 'com.github.ben-manes.versions'
 buildscript {
     repositories {
         jcenter()
-        maven { url 'https://maven.fabric.io/public' }
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:2.1.2'
         classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
         //check with ./gradlew dependencyUpdates
         classpath 'com.github.ben-manes:gradle-versions-plugin:0.13.0'
-        classpath 'io.fabric.tools:gradle:1.21.7'
     }
 }
 allprojects {
     repositories {
         jcenter()
-        maven { url 'https://maven.fabric.io/public' }
         maven { url "https://jitpack.io" }
     }
 }