validator: optional_float_validator to take a float

nabu/resources/validators.py

@@ -189,7 +189,9 @@ def float_validator(val):
 
 @validator
 def optional_float_validator(val):
-    if len(val.strip()) >= 1:
+    if isinstance(val, float):
+        return val
+    elif len(val.strip()) >= 1:
         val_float, error = convert_to_float(val)
         assert error is None, "Invalid number"
     else: