Refactor cast function in utils.py (#1340)

- less indentation, more readable code
- early return

plexapi/utils.py

@@ -144,22 +144,21 @@ def cast(func, value):
             func (func): Callback function to used cast to type (int, bool, float).
             value (any): value to be cast and returned.
     """
-    if value is not None:
-        if func == bool:
-            if value in (1, True, "1", "true"):
-                return True
-            elif value in (0, False, "0", "false"):
-                return False
-            else:
-                raise ValueError(value)
-
-        elif func in (int, float):
-            try:
-                return func(value)
-            except ValueError:
-                return float('nan')
-        return func(value)
-    return value
+    if value is None:
+        return value
+    if func == bool:
+        if value in (1, True, "1", "true"):
+            return True
+        if value in (0, False, "0", "false"):
+            return False
+        raise ValueError(value)
+
+    if func in (int, float):
+        try:
+            return func(value)
+        except ValueError:
+            return float('nan')
+    return func(value)
 
 
 def joinArgs(args):