More work on the rewrite

build.gradle

@@ -49,7 +49,7 @@ repositories {
 		name = "Speiger Maven"
 		url = "https://maven.speiger.com/repository/main"
 	}
-	maven { url "https://central.sonatype.com/repository/maven-snapshots" }
+	maven { url = "https://central.sonatype.com/repository/maven-snapshots" }
 }
 
 
@@ -93,15 +93,12 @@ dependencies {
 }
 
 jar {
-	manifest {
-		attributes "Main-Class": 'speiger.src.coreengine.NewRenderEngineTest'
-	}
 	sourceSets.each { ss ->
         from ss.output
     }
-	from {
+    from {
 		configurations.runtimeClasspath.collect { 
-			it.isDirectory() ? it : zipTree(it)
+			!it.exists() ? null : (it.isDirectory() ? it : zipTree(it))
 		}
 	}
 	duplicatesStrategy = DuplicatesStrategy.INCLUDE
@@ -113,11 +110,6 @@ task srcJar(type: Jar) {
 	sourceSets.each { ss ->
         from ss.allSource
     }
-	from {
-		configurations.runtimeClasspath.collect { 
-			it.isDirectory() ? it : zipTree(it)
-		}
-	}
 	duplicatesStrategy = DuplicatesStrategy.INCLUDE
 }