chore: prevent undefined error

Author: philippfromme

lib/base/VariableResolver.js

@@ -277,7 +277,7 @@ export class BaseVariableResolver {
     return reversedVariables.filter(variable => {
 
       // if external variable, keep
-      if (variable.provider.find(extractor => extractor !== this._baseExtractor)) {
+      if ((variable.provider || []).find(extractor => extractor !== this._baseExtractor)) {
         return true;
       }
 

lib/zeebe/VariableResolver.js

@@ -41,23 +41,23 @@ export default class ZeebeVariableResolver extends BaseVariableResolver {
 
     const namesToFilter = getElementNamesToRemove(moddleElement, inputOutput);
 
-    return variables.filter(v => {
+    return variables.filter(variable => {
 
       // Keep all variables that are also defined in other elements
-      if (v.origin.length > 1 || v.origin[0] !== bo) {
+      if (variable.origin.length > 1 || variable.origin[0] !== bo) {
         return true;
       }
 
       // Keep all variables from external data providers in outputs
       if (
         is(moddleElement, 'zeebe:Output') &&
-        v.provider.find(extractor => extractor !== this._baseExtractor)
+        (variable.provider || []).find(extractor => extractor !== this._baseExtractor)
       ) {
         return true;
       }
 
       // Filter all pre-defined variables
-      return !namesToFilter.includes(v.name);
+      return !namesToFilter.includes(variable.name);
     });
   }