frobar: Handle PulseAudio sinks without active port

No idea in which conditions those happen, but apparently they do happen.

hm/desktop/frobar/frobar/common.py

@@ -531,6 +531,10 @@ class MultiSectionsProvider(Provider):
     async def getSectionUpdater(self, section: Section) -> typing.Callable:
         raise NotImplementedError()
 
+    @staticmethod
+    async def doNothing() -> None:
+        pass
+
     async def updateSections(self, sections: set[Sortable], module: Module) -> None:
         moduleSections = self.sectionKeys[module]
         async with asyncio.TaskGroup() as tg:

hm/desktop/frobar/frobar/providers.py

@@ -432,7 +432,11 @@ class PulseaudioProvider(
 
         sink = self.sinks[section.sortKey]
 
-        if (
+        icon = "?"
+
+        if sink.port_active is None:
+            pass
+        elif (
             sink.port_active.name == "analog-output-headphones"
             or sink.port_active.description == "Headphones"
         ):
@@ -444,8 +448,6 @@ class PulseaudioProvider(
             icon = ""
         elif sink.port_active.name in ("headset-output", "headphone-output"):
             icon = ""
-        else:
-            icon = "?"
 
         section.numberStates = 3
         section.state = 1
@@ -497,9 +499,6 @@ class NetworkProvider(
         self.time = loop.time()
         self.io_counters = psutil.net_io_counters(pernic=True)
 
-    async def doNothing(self) -> None:
-        pass
-
     @staticmethod
     def getIfaceAttributes(iface: str) -> tuple[bool, str, bool]:
         relevant = True