Fixed generate_remote_standalone_redis_cmd bad operand (#363)

Author: filipecosta90

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "redisbench-admin"
-version = "0.9.6"
+version = "0.9.7"
 description = "Redis benchmark run helper. A wrapper around Redis and Redis Modules benchmark tools ( ftsb_redisearch, memtier_benchmark, redis-benchmark, aibench, etc... )."
 authors = ["filipecosta90 <[email protected]>","Redis Performance Group <[email protected]>"]
 readme = "README.md"

redisbench_admin/run_remote/standalone.py

@@ -114,7 +114,8 @@ def generate_remote_standalone_redis_cmd(
         logfile, temporary_dir
     )
     if enable_redis_7_config_directives:
-        initial_redis_cmd = +" --enable-debug-command {} ".format(enable_debug_command)
+        extra_str = " --enable-debug-command {} ".format(enable_debug_command)
+        initial_redis_cmd = initial_redis_cmd + extra_str
     full_logfile = "{}/{}".format(temporary_dir, logfile)
     if redis_configuration_parameters is not None:
         for (