fix Luis:build lost error message for some cases

[cosmicshuai]

Suppose we have a lu file to build

# Why
- help
- what can I say
- why do you need my name?
- why age?
- what do you need my profile for?
- why do you ask?
- why do you need that information? 

@ phraselist Test1
    - t1
    - q1

@ phraselist Test2
    - t2
    - q2

@ phraselist Test3
    - t3
    - q3

@ phraselist Test4
    - t4
    - q4

@ phraselist Test5
    - t5
    - q5

@ phraselist Test6
    - t6
    - q6

@ phraselist Test7
    - t7
    - q7

@ phraselist Test8
    - t8
    - q8

@ phraselist Test9
    - t9
    - q9

@ phraselist Test10
    - t10
    - q10

@ phraselist Test11
    - t11
    - q11

@ phraselist Test12
    - t12
    - q1

For previous bf-luis-cli build, this will throw an error:
Luis build failed: undefined

In this PR, the luis: build command will return a more detailed error message:
Luis build failed: [ERROR] intent Why has 12 phraselist descriptors (feature). At most 10 is allowed.