Check for null or empty embedding request

[givenscj]

Prevent an empty/null text from being sent to gateway

The issue or feature being addressed

Fixes #{bug number} (in this specific format)

Details on the issue fix or feature implementation

Can cause an infinite loop in langchain/gateway api.

Confirm the following

• [x ] I started this PR by branching from the head of the default branch
• [x ] I have targeted the PR to merge into the default branch
• This PR needs to be cherry-picked into at least one release branch
• I have included unit tests for the issue/feature
• I have included inline docs for my changes, where applicable
• [x ] I have successfully run a local build
• I have provided the required update scripts, where applicable
• I have updated relevant docs, where applicable

Note

Instead of adding X's inside the checkboxes you wish to check above, first submit the PR, then check the boxes in the rendered description.