if there is anything wrong with the cached constant_resolver, discard it

Cargo.toml

@@ -2,7 +2,7 @@
 
 [package]
 name = "pks"
-version = "0.2.18"
+version = "0.2.19"
 edition = "2021"
 description = "Welcome! Please see https://github.com/rubyatscale/pks for more information!"
 license = "MIT"

src/packs/parsing/ruby/zeitwerk/mod.rs

@@ -186,14 +186,16 @@ struct ConstantResolverCache {
 fn get_constant_resolver_cache(cache_dir: &Path) -> ConstantResolverCache {
     let path = cache_dir.join("constant_resolver.json");
     if path.exists() {
-        let file = std::fs::File::open(path).unwrap();
-        let reader = std::io::BufReader::new(file);
-        serde_json::from_reader(reader).unwrap()
-    } else {
-        ConstantResolverCache {
-            file_definition_map: HashMap::new(),
+        if let Ok(file) = std::fs::File::open(path) {
+            let reader = std::io::BufReader::new(file);
+            if let Ok(cache) = serde_json::from_reader(reader) {
+                cache
+            }
         }
     }
+    ConstantResolverCache {
+        file_definition_map: HashMap::new(),
+    }
 }
 
 fn cache_constant_definitions(