timedated: make sure GetAll() succeeds in systems lacking /dev/rtc (such as containers)

src/libsystemd-bus/bus-util.c

@@ -931,7 +931,8 @@ int bus_map_all_properties(sd_bus *bus,
         assert(path);
         assert(map);
 
-        r = sd_bus_call_method( bus,
+        r = sd_bus_call_method(
+                        bus,
                         destination,
                         path,
                         "org.freedesktop.DBus.Properties",

src/timedate/timedated.c

@@ -470,6 +470,9 @@ static int property_get_rtc_time(
         if (r == -EBUSY) {
                 log_warning("/dev/rtc is busy, is somebody keeping it open continously? That's not a good idea... Returning a bogus RTC timestamp.");
                 t = 0;
+        } else if (r == -ENOENT) {
+                log_debug("Not /dev/rtc found.");
+                t = 0; /* no RTC found */
         } else if (r < 0)
                 return sd_bus_error_set_errnof(error, r, "Failed to read RTC: %s", strerror(-r));
         else