lisk.api().sendRequest() should check validity of its params

[slaweet]

Expected behaviour

Uncaught Invalid parameter value: 'limit'
In browser console it should throw and error saying something like:

> lisk.api().sendRequest('delegates/', {limit:undefined})
TypeError: sendRequest was called Invalid value 'undefined' of parameter 'limit'

Actual behaviour

In browser console:

> lisk.api().sendRequest('delegates/', {limit:undefined})
liskApi.js?e8ff:293 Uncaught TypeError: this.trimObj is not a function
    at eval (eval at <anonymous> (http://localhost:8080/app.js:4799:2), <anonymous>:293:130)
    at Array.reduce (native)
    at LiskAPI.trimObj (eval at <anonymous> (http://localhost:8080/app.js:4799:2), <anonymous>:292:26)
    at LiskAPI.serialiseHttpData (eval at <anonymous> (http://localhost:8080/app.js:4799:2), <anonymous>:282:20)
    at LiskAPI.changeRequest (eval at <anonymous> (http://localhost:8080/app.js:4799:2), <anonymous>:247:59)
    at LiskAPI.sendRequestPromise (eval at <anonymous> (http://localhost:8080/app.js:4799:2), <anonymous>:214:28)
    at LiskAPI.sendRequest (eval at <anonymous> (http://localhost:8080/app.js:4799:2), <anonymous>:189:14)
    at <anonymous>:1:12

It makes it difficult to figure out what actually went wrong if there are more calls and more parameters.