fix: sanitize authentication input

edgecase where value is null instead of expected empty string

packages/bruno-app/src/utils/importers/insomnia-collection.js

@@ -60,6 +60,7 @@ const addSuffixToDuplicateName = (item, index, allItems) => {
 const regexVariable = new RegExp('{{.*?}}', 'g');
 
 const normalizeVariables = (value) => {
+  value = value || '';
   const variables = value.match(regexVariable) || [];
   each(variables, (variable) => {
     value = value.replace(variable, variable.replace('_.', '').replaceAll(' ', ''));