fix: improve composeDirective error message

[dariuszkuc]

Since we cannot easily fix incorrect directive definition (#3281) without breaking our clients. This PR improves error messages when @composeDirective arguments are NULL or empty strings.

Previous message on undefined/null argument value

Cannot read properties of undefined (reading '0')

New message

Argument to @composeDirective in subgraph "${sg.name}" cannot be NULL or an empty String

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Latest commit: bb248c4

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[apollo-librarian]

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* (developer-tools)/apollo-mcp-server/(latest)/best-practices.mdx

Build ID: 8418da277dc72e7f065113c6

URL: https://www.apollographql.com/docs/deploy-preview/8418da277dc72e7f065113c6