test: fix taxonomy & variant entries test cases

Author: aman19K

packages/contentstack-import/src/import/modules/taxonomies.ts

@@ -94,6 +94,11 @@ export default class ImportTaxonomies extends BaseClass {
    * @returns {Promise<any>} Promise<any>
    */
   async importTaxonomies({ apiContent, localeCode }: { apiContent: any[]; localeCode?: string }): Promise<void> {
+    if (!apiContent || apiContent?.length === 0) {
+      log.debug('No taxonomies to import', this.importConfig.context);
+      return;
+    }
+
     const onSuccess = ({ apiData }: any) => this.handleSuccess(apiData, localeCode);
     const onReject = ({ error, apiData }: any) => this.handleFailure(error, apiData, localeCode);
 

packages/contentstack-import/test/unit/import/modules/taxonomies.test.ts

@@ -36,6 +36,7 @@ describe('ImportTaxonomies', () => {
     mockImportConfig = {
       apiKey: 'test',
       backupDir: testBackupDir,
+      contentDir: testBackupDir,
       context: { module: 'taxonomies' },
       concurrency: 2,
       fetchConcurrency: 3,

packages/contentstack-import/test/unit/import/modules/variant-entries.test.ts

@@ -76,6 +76,7 @@ describe('ImportVariantEntries', () => {
   beforeEach(() => {
     mockImportConfig = {
       contentDir: '/test/backup',
+      backupDir: '/test/backup',
       apiKey: 'test-api-key',
       context: {
         command: 'cm:stacks:import',
@@ -528,7 +529,7 @@ describe('ImportVariantEntries', () => {
     it('should handle different data paths in projectMapperFilePath construction', () => {
       const customConfig = {
         ...mockImportConfig,
-        contentDir: '/custom/backup/path'
+        backupDir: '/custom/backup/path'
       };
       const customImportVariantEntries = new ImportVariantEntries({ 
         importConfig: customConfig