fix: resolve path expression on Any-typed variable as Any, not Null

Related to #87

Author: barinali

lib/zeebe/util/feelUtility.js

@@ -106,6 +106,19 @@ function resolveReferences(variablesToResolve, allVariables) {
       computedResult.value.info = expression;
     }
 
+    // If the result is null but a referenced variable is "Any"-typed (unknown
+    // structure), accessing a property on it should also yield "Any", not "Null".
+    // cf. https://github.com/bpmn-io/variable-resolver/issues/87
+    else if (computedResult.value.atomicValue === null &&
+        unresolvedRoots.some(name => {
+          const entry = scopedContext.entries[name];
+          return entry instanceof EntriesContext &&
+                 getType(entry.value) === 'Any';
+        })) {
+      computedResult = EntriesContext.of(undefined);
+      computedResult.value.info = expression;
+    }
+
     // Ensure we don't copy the scope from the mapped variable
     computedResult.scope = variable.scope;