pulumi convert --from terraform should error if there are no terraform files to convert.

[guineveresaenger]

What happened?

Working in the bridge using temp dirs to generate some example code, I was in the incorrect directory running pulumi convert. The command succeeded. It should have errored out with "no Terrafrom files to convert". Took me entirely too long to realize what was happening.

The convert tool should let the user know about missing input.

Example

guin /Users/guin🦉 mkdir convert
guin /Users/guin🦉 cd convert
guin guin/convert🦉 ls
guin guin/convert🦉 pulumi convert --from terraform --language pcl
Converting from terraform...
Converting to pcl...
guin guin/convert🦉 ls                                            
guin guin/convert🦉 

Output of pulumi about

guin guin/convert🦉 pulumi about
CLI          
Version      3.116.1
Go Version   go1.22.3
Go Compiler  gc

Host     
OS       darwin
Version  13.5
Arch     arm64

Backend        
Name           pulumi.com
URL            https://app.pulumi.com/guinevere-pulumi-corp
User           guinevere-pulumi-corp
Organizations  guinevere-pulumi-corp, pulumi
Token type     personal

Pulumi locates its logs in /var/folders/87/6b426tw97kl6vb55pl6nbzym0000gn/T/ by default

Additional context

No response

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