@nrwl/react:app/lib and @nrwl/express:app/lib should fail if name isn't supplied

[catfireparty]

From here: #333 (comment)

Both nx g @nrwl/express:app/lib and nx g @nrwl/react:app/lib create files in the root of /apps//libs if the user does not provide an application name.

These schematics should fail with an error if the name is empty.

This should be a matter of either validating the options/schema before running any of the following rules, or possibly just adding a regex which will fail if the input is empty (note that libs starting with numbers would also be invalid, so something like ^[a-zA-Z]{1}.*$ might suffice.

[cristianmartinez]

Is someone working on this? @jdpearce can I take it?

[github-actions]

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