Merge pull request #156 from pepijnve/empty_buildtasks

Avoid exception when buildtasks is an empy list

Author: danez

src/main/groovy/net/researchgate/release/ReleasePlugin.groovy

@@ -117,8 +117,11 @@ class ReleasePlugin extends PluginHelper implements Plugin<Project> {
 
         if (supportsMustRunAfter) {
             project.afterEvaluate {
-                project.tasks[extension.buildTasks.first()].mustRunAfter(project.tasks.beforeReleaseBuild)
-                project.tasks.afterReleaseBuild.mustRunAfter(project.tasks[extension.buildTasks.last()])
+                def buildTasks = extension.buildTasks
+                if (!buildTasks.empty) {
+                    project.tasks[buildTasks.first()].mustRunAfter(project.tasks.beforeReleaseBuild)
+                    project.tasks.afterReleaseBuild.mustRunAfter(project.tasks[buildTasks.last()])
+                }
             }
         }