fix: safe check for config command (#589)

Author: stephenlacy

packages/cli/src/commands/config/config.js

@@ -7,9 +7,9 @@ function isValidRNDependency(config) {
   return (
     Object.keys(config.platforms).filter(key => Boolean(config.platforms[key]))
       .length !== 0 ||
-    Object.keys(config.hooks).length !== 0 ||
-    config.assets.length !== 0 ||
-    config.params.length !== 0
+    (config.hooks && Object.keys(config.hooks).length !== 0) ||
+    (config.assets && config.assets.length !== 0) ||
+    (config.params && config.params.length !== 0)
   );
 }