engine: server: do not apply sound precache check for sentences, as they may start with 0 index

engine/server/sv_game.c

@@ -2091,12 +2091,12 @@ int SV_BuildSoundMsg( sizebuf_t *msg, edict_t *ent, int chan, const char *sample
 		// precache_sound can be used twice: cache sounds when loading
 		// and return sound index when server is active
 		sound_idx = SV_SoundIndex( sample );
-	}
 
-	if( !sound_idx )
-	{
-		Con_Printf( S_ERROR "SV_StartSound: %s not precached (%d)\n", sample, sound_idx );
-		return 0;
+		if( !sound_idx )
+		{
+			Con_Printf( S_ERROR "SV_StartSound: %s not precached (%d)\n", sample, sound_idx );
+			return 0;
+		}
 	}
 
 	spawn = FBitSet( flags, SND_RESTORE_POSITION ) ? false : true;