FIX: lots of bugfixes, sorry for ugly commit

app/Console/Commands/InstallModule.php

@@ -93,7 +93,7 @@ class InstallModule extends Command
         }
 
         // we cannot rely on config() helper, because this module does not have to be published
-        $config = @include($path);
+        $config = include($path);
 
         return $config;
     }
@@ -146,7 +146,7 @@ class InstallModule extends Command
             throw new \Exception('Module ' . $config['name'] . ' already exists in database.');
         }
 
-        if (!$module) {
+        if (is_null($module)) {
             // insert module into database
             $settings = [
                 'staticName' => $this->moduleName,