Fix required number input does not require a value #538
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Bug fix.
When using a input of type number that should be required, you actually do not get a validation error.
Instead value in model is set to null.
see https://jsfiddle.net/j04uhscq/17/
=> age field is required but not setting it does not lead to a validation error
Root cause for issue was that a null input becomes a NaN.
Lodash's isNumber (used in number validator) returns true for that, so replaced it by isFinite