restore cache in CI + align to master

Author: alonre24

.circleci/config.yml

@@ -116,6 +116,9 @@ commands:
           command: |
             if [[ $(uname -s) == Darwin ]]; then sed -i 's/regex = "1"/regex = { version = "1", features = ["perf", "unicode"] }/g' Cargo.toml; fi
             cat Cargo.toml
+      - restore_cache:
+          keys:
+            - v3-dependencies-{{ arch }}-{{ checksum "Cargo.toml" }}
       - run:
           name: Check formatting
           shell: /bin/bash -l -eo pipefail

src/redismodule.rs

@@ -101,9 +101,6 @@ pub fn decode_args(
     argv: *mut *mut raw::RedisModuleString,
     argc: c_int,
 ) -> Vec<RedisString> {
-    if argv.is_null() {
-        return Vec::new();
-    }
     unsafe { slice::from_raw_parts(argv, argc as usize) }
         .iter()
         .map(|&arg| RedisString::new(NonNull::new(ctx), arg))