How do print out Tag name out in the error message

MIT App Inventor Help
1

In [When click do ] to this I attach call FIrebaseDB1.GetValue. This has to plugins tag and valueIfTagNoThere. I want to print an error if there is no stored value and the Tag name too. How can I do it. It is very simple but nowhere could I get an answer for it. Thanks

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2

Use the Firebase GotValue block to get the value

3

Are you asking how to prevent blanks entries from being sent into FireBase?

Use an if/then test to complain if the UseName.Text is empty or the SavedData.Text is empty,
otherwise do the FireBase StoreValue.

4

Thanks TIMA12 I had that working like this:

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What I was hoping was a plugin to valueIfTagNotThere which would be like if(valueIfTagNotThere) then Print Tag name and an error message. I was looking if that kind of block is there.

5

Thanks ABG this is a good thought. I will add this feature too.