Updated input.js

Avoid uncontrolled input:
Added default state value to '' instead of undefined

Author: Dustyn Blackmore

src/components/Input.js

@@ -11,7 +11,7 @@ class Input extends Component {
       initialValue: this.props.initialValue || undefined,
       isValid: false,
       justChanged: false,
-      value: this.props.value || undefined,
+      value: this.props.value || '',
       valueMask: this.props.valueMask || undefined,
     };