feat(-Au): only warn when an installed package can't be found on the AUR

Previously this would halt Aura completely. Packages occasionally
disappear from the AUR, which then triggers this, and it's quite annoying.

rust/aura-pm/src/command/aur.rs

@@ -6,7 +6,7 @@ use crate::env::Env;
 use crate::error::Nested;
 use crate::localization::Localised;
 use crate::utils::{Finished, PathStr, ResultVoid, NOTHING};
-use crate::{aura, green, proceed};
+use crate::{aura, green, proceed, yellow};
 use aura_core::Apply;
 use colored::{ColoredString, Colorize};
 use from_variants::FromVariants;
@@ -502,8 +502,21 @@ pub(crate) fn upgrade<'a>(
     let clones: HashSet<PathBuf> = foreigns
         .par_iter()
         .map(|p| p.name.as_ref())
-        .map(|p| {
-            aura_core::aur::clone_path_of_pkgbase(&env.aur.clones, p, &crate::fetch::fetch_json)
+        .filter_map(|p| {
+            let rpath = aura_core::aur::clone_path_of_pkgbase(
+                &env.aur.clones,
+                p,
+                &crate::fetch::fetch_json,
+            );
+
+            match rpath {
+                Ok(path) => Some(Ok(path)),
+                Err(aura_core::aur::Error::PackageDoesNotExist(p)) => {
+                    yellow!(fll, "faur-unknown", pkg = p);
+                    None
+                }
+                Err(e) => Some(Err(e)),
+            }
         })
         .collect::<Result<HashSet<_>, aura_core::aur::Error>>()?;
     debug!("Unique clones: {}", clones.len());