Fix those scary SystemErrors we see in DS

As it turns out, my old OnServerInitComplete fix didn't check to see if
the script had an OnServerInitComplete method. So, when we called that
method-of-doom from C++, we'd see a SystemError. Aside from removing an
error message, this probably has no effect.

Sources/Plasma/FeatureLib/pfPython/plPythonFileMod.cpp

@@ -859,28 +859,29 @@ void plPythonFileMod::AddTarget(plSceneObject* sobj)
                 // We should really let the script know about that via OnServerInitComplete anyway because it's
                 // not good to make assumptions about game state in workarounds for that method not being called
                 plNetClientApp* na = plNetClientApp::GetInstance();
-                if (!na->GetFlagsBit(plNetClientApp::kLoadingInitialAgeState) &&
-                     na->GetFlagsBit(plNetClientApp::kPlayingGame))
+                if (!na->GetFlagsBit(plNetClientApp::kLoadingInitialAgeState) && na->GetFlagsBit(plNetClientApp::kPlayingGame))
                 {
                     plgDispatch::Dispatch()->UnRegisterForExactType(plInitialAgeStateLoadedMsg::Index(), GetKey());
-                    plProfile_BeginTiming(PythonUpdate);
-                    // call it
-                    PyObject* retVal = PyObject_CallMethod(
-                            fPyFunctionInstances[kfunc_OnServerInitComplete],
-                            (char*)fFunctionNames[kfunc_OnServerInitComplete], nil);
-                    if ( retVal == nil )
+                    if (fPyFunctionInstances[kfunc_OnServerInitComplete])
                     {
+                        plProfile_BeginTiming(PythonUpdate);
+                        // call it
+                        PyObject* retVal = PyObject_CallMethod(fPyFunctionInstances[kfunc_OnServerInitComplete],
+                                (char*)fFunctionNames[kfunc_OnServerInitComplete], nil);
+                        if ( retVal == nil )
+                        {
 #ifndef PLASMA_EXTERNAL_RELEASE
-                        // for some reason this function didn't, remember that and not call it again
-                        fPyFunctionInstances[kfunc_OnServerInitComplete] = nil;
+                            // for some reason this function didn't, remember that and not call it again
+                            fPyFunctionInstances[kfunc_OnServerInitComplete] = nil;
 #endif  //PLASMA_EXTERNAL_RELEASE
-                        // if there was an error make sure that the stderr gets flushed so it can be seen
-                        ReportError();
+                            // if there was an error make sure that the stderr gets flushed so it can be seen
+                            ReportError();
+                        }
+                        Py_XDECREF(retVal);
+                        plProfile_EndTiming(PythonUpdate);
+                        // display any output (NOTE: this would be disabled in production)
+                        DisplayPythonOutput();
                     }
-                    Py_XDECREF(retVal);
-                    plProfile_EndTiming(PythonUpdate);
-                    // display any output (NOTE: this would be disabled in production)
-                    DisplayPythonOutput();
                 }
 
                 // display python output