Metadata handler unit test can fail randomly

[rhoggSugarcrm]

 1) Metadata Handler generateFieldValue decimals should return a number with the proper number of digits:
     TypeError: Cannot read property 'length' of undefined
      at Context.it (tests/metadata-handler.js:129:35)
      at Test.Runnable.run (node_modules/co-mocha/lib/co-mocha.js:43:16)