skip getting the range when the argument is not present

Author: Tomas Winkler

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@kentico/kontent-cli",
-  "version": "0.5.0",
+  "version": "0.5.1",
   "description": "Command line interface tool that can be used for generating and running Kontent migration scripts",
   "main": "./lib/index.js",
   "types": "./lib/types/index.d.ts",

src/cmds/migration/run.ts

@@ -111,7 +111,7 @@ const runMigrationCommand: yargs.CommandModule = {
         let apiKey = argv.apiKey;
         const migrationName = argv.name;
         const runAll = argv.all;
-        const runRange = getRange(argv.range);
+        const runRange = argv.range && exports.getRange(argv.range);
         const debugMode = argv.debug;
         const continueOnError = argv.continueOnError;
         let migrationsResults: number = 0;