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William FH 528fc76d6a Update Prompt Format Error (#14044 )

The number of times I try to format a string (especially in lcel) is
embarrassingly high. Think this may be more actionable than the default
error message. Now I get nice helpful errors


```
KeyError: "Input to ChatPromptTemplate is missing variable 'input'.  Expected: ['input'] Received: ['dialogue']"
```

2023-12-01 09:06:35 -08:00