fix: correct check for required attribute #132
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### Description
Currently, in the current code, the `required` attribute does not work as expected.
On the code path where it should "continue if not required" actually just fallback into the error printing and process exiting.
Small reproducible example:
```rust
#[dotenvy::load(required = false)]
#[tokio::main]
async fn main() {
let _ = env::var("SOME_VAR").unwrap();
}
```
Which errors out with:
```
Failed to load env file from path './.env': error reading './.env':, No such file or directory (os error 2)
```
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Description
Currently, in the current code, the
requiredattribute does not work as expected. On the code path where it should "continue if not required" actually just fallback into the error printing and process exiting.Small reproducible example:
Which errors out with: