[bug] prevent a false bool in a process to be mistaken with absence of value

src/services/service.ts

@@ -369,7 +369,7 @@ export default class Services {
           let retrievedValues: Record<string, string> = {};
           for (const diff of diffs) {
             // Check if `new_value` is missing
-            if (!diff.new_value) {
+            if (diff.new_value === null) {
               const hash = diff.value_commitment;
               if (!hash) {
                 console.error('No commitment for diff');