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update to swift 4 #120

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@@ -757,8 +757,8 @@ class KeyboardViewController: UIInputViewController {
}

func stringIsWhitespace(_ string: String?) -> Bool {
if string != nil {
for char in (string!).characters {
if let string = string {
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I'd probably use a guard here instead, or even change the method to only accept unwrapped strings.

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