fix: adjust power calculation function (#93)

* fix: adjust power calculation function

* adjust pylint config

Author: firstof9

openevsehttp/__init__.py

@@ -816,14 +816,16 @@ def wifi_serial(self) -> str | None:
         return None
 
     @property
-    def charging_power(self) -> float:
+    def charging_power(self) -> float | None:
         """Return the charge power.
 
         Calculate Watts base on V*I
         """
-        assert self._status is not None
-        value = round(self._status["voltage"] * self._status["amp"], 2)
-        return value
+        if self._status is not None and any(
+            key in self._status for key in ["voltage", "amp"]
+        ):
+            return round(self._status["voltage"] * self._status["amp"], 2)
+        return None
 
     # There is currently no min/max amps JSON data
     # available via HTTP API methods

pylintrc

@@ -16,7 +16,6 @@ max-attributes=15
 # too-few-* - same as too-many-*
 # import-outside-toplevel - TODO
 disable=
-  bad-continuation,
   duplicate-code,
   fixme,
   import-outside-toplevel,
@@ -26,7 +25,6 @@ disable=
   too-many-public-methods,
   too-many-instance-attributes,
   too-many-branches,
-  no-self-use,
   too-many-statements
 
 [REPORTS]