feat(build): improve error message for when semantic.json is not found

Improve error message for when semantic.json cannot be found.

I was having an issue with my setup where semantic.json couldn't be found. Looking at require-dot-file, it seems false is returned when semantic.json isn't found. An error is printed only when the MODULE_NOT_FOUND error is thrown which wasn't happening in my case.

tasks/config/user.js

@@ -29,10 +29,13 @@ var
 try {
   // looks for config file across all parent directories
   userConfig = requireDotFile('semantic.json', process.cwd());
+  if(userConfig.valueOf() === false) {
+    console.error('No semantic.json config found');
+  }
 }
 catch(error) {
   if(error.code === 'MODULE_NOT_FOUND') {
-    console.error('No semantic.json config found');
+    console.error('require-dot-file module not found');
   }
 }