Empty Text Verification of Captcha allows an attempt to submit the Form

• Type: Bug
• Status: Verified
• Resolution: Unresolved
• Affects Version/s: 7.3.X, Master
• Fix Version/s: None
• Component/s: Forms
• Labels: None
• Fix Priority: 3
• Sprint: Forms_7.4_05

 Steps to Reproduce:

1. Add a new form
2. Add a text field
3. Go to form Settings
4. Enable "Require CAPTCHA"
5. Publish form
6. Go to publication URL
7. Click on the Text Verification input of CAPTCHA
8. Click out of the Text Verification input of CAPTCHA
9. Try to Submit form

 Expected Result:
There should not be an attempt to submit the Form until the Text Verification field is filled out.

 Actual Result:
Although the Form is not submitted (there are no entries in view entries), there is an attempt to send the Form (the page is reloaded and then an error message appears).