Remove unreachable code branches

Signed-off-by: hi-rustin <rustin.liu@gmail.com>

src/cargo/ops/cargo_add/mod.rs

@@ -314,9 +314,7 @@ fn resolve_dependency(
         } else {
             let source = crate::sources::PathSource::new(&path, src.source_id()?, config);
             let mut packages = source.read_packages()?;
-            let package = packages
-                .pop()
-                .ok_or(anyhow::anyhow!("no packages found at `{src}`"))?;
+            let package = packages.pop().expect("at least one package");
             Dependency::from(package.summary())
         };
         selected
@@ -606,9 +604,7 @@ fn infer_package_for_git_source(
     src: &dyn std::fmt::Display,
 ) -> CargoResult<Package> {
     let package = match packages.len() {
-        0 => {
-            anyhow::bail!("no packages found at `{src}`");
-        }
+        0 => unreachable!(),
         1 => packages.pop().expect("match ensured element is present"),
         _ => {
             let mut names: Vec<_> = packages