georust / georust/proj

Handle a null return value for `proj_sys::proj_errno_string` in the `proj` crate

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Rust
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Description

We use `proj_sys::proj_errno_string` in the `proj` crate. The `proj_sys::proj_errno_string` function can return a null pointer, but we don't handle that case currently.

See this comment for context: https://github.com/georust/proj/pull/72/files#r574590647

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