fix(EntityTypeError): support not object values

Author: blond

lib/entity-type-error.js

@@ -9,12 +9,13 @@ const ExtendableError = require('es6-error');
  */
 module.exports = class EntityTypeError extends ExtendableError {
     /**
-     * @param {object} obj — not valid object
+     * @param {*} obj — not valid object
      * @param {string} [reason] — human-readable reason why object is not valid
      */
     constructor(obj, reason) {
         const str = util.inspect(obj, { depth: 1 });
-        const message = `the object \`${str}\` is not valid BEM entity`;
+        const type = obj ? typeof obj : '';
+        const message = `the ${type} \`${str}\` is not valid BEM entity`;
 
         super(reason ? `${message}, ${reason}` : message);
     }