fixed: check props.clientRect before creating ReactRenderer

[hariacharya80]

Please describe your changes

Moved validation to top of the onStart function.

How did you accomplish your changes

[add a detailed description of how you accomplished your changes here]

Moved Validation:

 if (!props.clientRect) {
          return
        }

to the first line of onStart, see commits.

Remarks

Reduce bugs risk for Chinese users

Checklist

• The changes are not breaking the editor
• Added tests where possible
• Followed the guidelines
• Fixed linting issues

Related issues

closes #4137

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[bdbch]

Thanks - good find.

[bdbch]

Could you fix those issues we have with the PR? @hariacharya80

[hariacharya80]

Could you fix those issues we have with the PR? @hariacharya80

Ohh sorry for not seeing this comment, Ok let me get that just few mins..

[hariacharya80]

@bdbch Done!