fixed error at line 401 (#2046)

git-sumitchaudhary · web-flow · commit 50542335f22e · 2025-05-29T06:41:11.000+02:00
when using postcss using parcel 
an error was occuring due to  no check mentioned for value at line 401 , which caused error while reading value when it was undefined
hence i added a check if its value is undefined continue and dont move forward
diff --git a/lib/node.js b/lib/node.js
@@ -399,6 +399,9 @@ class Node {
       } else if (typeof value === 'object' && value.toJSON) {
         fixed[name] = value.toJSON(null, inputs)
       } else if (name === 'source') {
+         if (value == null) {
+                  continue;
+             }
         let inputId = inputs.get(value.input)
         if (inputId == null) {
           inputId = inputsNextIndex
