Do not ASSERT when notifying StubConditionVariable (#3088)

Os/Stub/ConditionVariable.cpp

@@ -10,13 +10,17 @@ namespace Stub {
 namespace Mutex {
 
 void StubConditionVariable::wait(Os::Mutex& mutex) {
+    // This stub implementation can only be used in deployments that never need to wait on any ConditionVariable.
+    // Trigger an assertion if anyone ever tries to wait.
     FW_ASSERT(0);
 }
 void StubConditionVariable::notify() {
-    FW_ASSERT(0);
+    // Nobody is waiting, because we assert if anyone tries to wait.
+    // Therefore, we can notify all waiters by doing nothing.
 }
 void StubConditionVariable::notifyAll() {
-    FW_ASSERT(0);
+    // Nobody is waiting, because we assert if anyone tries to wait.
+    // Therefore, we can notify all waiters by doing nothing.
 }
 
 ConditionVariableHandle* StubConditionVariable::getHandle() {