Error happens on RoundButton OnPress event

[a0987112361]

Describe the bug
A clear and concise description of what the bug is.

there's an error that happens on RoundButton component when the OnPress event is not giving, which will cause red screen error.

To Reproduce
Steps to reproduce the behavior:

simply not assign anything to OnPress event.

Expected behavior
A clear and concise description of what you expected to happen.

should be no error even the OnPress event is not giving any function or giving null.

Screenshots
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Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Version [e.g. 22]

Additional context
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