Fixed no email in Subscribe input area

[shivanshsin0203]

Fixes

Fixes #737 by @SoundaryaKoutharapu

Description

I have made span text area to show a message if no email is entered

Technical details

Tests

Screenshots

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[TimidRobot]

looks good! thank you!!

[shivanshsin0203]

@TimidRobot Sir, I wish to contribute more to the organization, I am well versed in HTML, CSS, and JavaScript, Can you please guide how I can do so?

[TimidRobot]

@TimidRobot Sir, I wish to contribute more to the organization, I am well versed in HTML, CSS, and JavaScript, Can you please guide how I can do so?

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