make sure we are in a Dapp

bin/embark

@@ -17,17 +17,19 @@ function launchEmbark() {
 }
 
 const path = require('path');
-require('colors');
 try {
   const dappPackage = require(path.join(process.cwd(), 'package.json'));
+  require(path.join(process.cwd(), 'embark.json')); // Make sure we are in a Dapp
   require('check-dependencies')(dappPackage, (state) => {
     if (state.status) {
+      require('colors');
       console.error('\nMissing dependencies. Please run npm install'.red);
       process.exit();
     }
     launchEmbark();
   });
-} catch (e) {
+} catch (_e) {
+  // We are not in a Dapp
   launchEmbark();
 }