GR-10385: pzip iterator stop when no iterable args are supplied

Author: cosminbasca

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/iterator/PZipBuiltins.java

@@ -36,6 +36,7 @@
 import com.oracle.graal.python.nodes.control.GetNextNode;
 import com.oracle.graal.python.nodes.function.PythonBuiltinNode;
 import com.oracle.graal.python.nodes.function.builtins.PythonUnaryBuiltinNode;
+import com.oracle.graal.python.runtime.exception.PythonErrorType;
 import com.oracle.truffle.api.dsl.Cached;
 import com.oracle.truffle.api.dsl.GenerateNodeFactory;
 import com.oracle.truffle.api.dsl.NodeFactory;
@@ -53,6 +54,11 @@ protected List<? extends NodeFactory<? extends PythonBuiltinNode>> getNodeFactor
     @GenerateNodeFactory
     public abstract static class NextNode extends PythonUnaryBuiltinNode {
 
+        @Specialization(guards = "isEmpty(self.getIterators())")
+        public Object __next__(@SuppressWarnings("unused") PZip self) {
+            throw raise(PythonErrorType.StopIteration);
+        }
+
         @Specialization
         public Object __next__(PZip self,
                         @Cached("create()") GetNextNode next) {