Add settling basin node, fixed issue with object assignment

additional_nodes/recirculation-pump.html

@@ -26,11 +26,11 @@
         },
         oneditsave: function() {
             let debit = parseFloat($("#node-input-F2").typedInput("value"));
-            if (isNaN(volume) || debit < 0) {
+            if (isNaN(debit) || debit < 0) {
                 RED.notify("Debit is not set correctly", {type: "error"});
             }
             let inlet = parseInt($("#node-input-n_inlets").typedInput("value"));
-            if (isNaN(inlet) || inlet < 1) {
+            if (inlet < 1) {
                 RED.notify("Number of inlets not set correctly", {type: "error"});
             }
         }