Fix: Prevent empty messages from being sent in chatbot input

[parasmottan]

🛠️ Description

Resolved an issue in the existing chatbot system (InvestIQ) where users could submit empty messages. Now, empty or whitespace-only input is blocked from being processed, improving the overall input handling and user experience.

🔗 Related Issues

• Closes Bug: Chatbot Accepting "No message"  #636

🔄 Type of PR

• Bug fix
• Feature enhancement
• Documentation update
• Other (specify): ___________

📸 Screenshots / Videos

Recording.2025-07-07.160941.mp4

✅ Checklist

• I have gone through the contributing guide
• I have updated my branch and synced it with the project main branch before making this PR
• I have performed a self-review of my code
• I have tested the changes thoroughly before submitting this pull request
• I have provided relevant issue numbers, screenshots, and videos after making the changes
• I have commented my code, particularly in hard-to-understand areas

🧠 Additional Context

• Empty string inputs are now ignored and not sent to the chatbot.
• No UI changes were made to the button itself.
• Small fix, but crucial for preventing meaningless interactions.

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[parasmottan]

the problem had been solved just with the single line of code