fix start workflow page with null in search attribute #2853
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Description & motivation 💭
There is a bug, when pressing on the "Start workflow like this one"

and the search attribute is null, it results an 500 error (which isn't really a 500 from the server, but an error in the client)

Testing 🧪
How was this tested 👻
Steps for others to test: 🚶🏽♂️🚶🏽♀️
Just have a worfklow with search attribute that is null, and press the run like this button, it will reproduce
Checklists
Draft Checklist
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Issue(s) closed
Docs
Any docs updates needed?