Merge branch 'tor-gitlab/mr/759' into maint-0.4.8

changes/ticket40848

@@ -0,0 +1,4 @@
+  o Minor bugfix (defensive programming):
+    - Disable multiple BUG warnings of a missing relay identity key when
+      starting an instance of Tor compiled without relay support.
+      Fixes bug 40848; bugfix on 0.4.3.1-alpha.

src/feature/relay/routerkeys.h

@@ -53,7 +53,6 @@ void routerkeys_free_all(void);
 static inline void *
 relay_key_is_unavailable_(void)
 {
-  tor_assert_nonfatal_unreached();
   return NULL;
 }
 #define relay_key_is_unavailable(type) \