Fixed bug where the default unit was "m" instead of sending None

When the log_activity function receives a value of None for the unit parameter, it logs value without applying a conversion multiplier.

fitnessCog/activities/lift.json

@@ -0,0 +1,38 @@
+{
+    "convertable": true,
+    "units": {
+        "kilogram": {
+            "factor": 1,
+            "aliases": [
+                "kg",
+                "kgs",
+                "kilogram",
+                "kilograms",
+                "kilogramme",
+                "kilogrammes",
+                "kg.",
+                "kgs."
+            ]
+        },
+        "pound": {
+            "factor": 0.45,
+            "aliases": [
+                "lb",
+                "lb.",
+                "lbs",
+                "lbs.",
+                "pound",
+                "pounds"
+            ]
+        },
+        "tonne": {
+            "factor": 1000,
+            "aliases": [
+                "t",
+                "t.",
+                "tonne",
+                "tonnes"
+            ]
+        }
+    }
+}

fitnessCog/fitness.py

@@ -12,7 +12,7 @@ class FitnessCog(commands.Cog):
     def __init__(self, bot):
         self.bot = bot
 
-        default_threads = "1457402451530350727,1328363409648910356"
+        default_threads = "1457402451530350727,1328363409648910356,1533433244186443827"
         threads_raw = os.getenv("THREADS_ID", default_threads)
 
         self.threads_id: list[int] = []
@@ -117,7 +117,7 @@ class FitnessCog(commands.Cog):
                 )
                 return
 
-            unit = parts[2] if len(parts) > 2 else "m"
+            unit = parts[2] if len(parts) > 2 else None
 
             timestamp = int(message.created_at.timestamp())
             username = message.author.name