advapi32/tests: Cope with empty servername.

dlls/advapi32/eventlog.c

@@ -324,7 +324,7 @@ HANDLE WINAPI OpenEventLogW( LPCWSTR uncname, LPCWSTR source )
         return NULL;
     }
 
-    if (uncname)
+    if (uncname && uncname[0])
     {
         FIXME("Remote server not supported\n");
         SetLastError(RPC_S_SERVER_UNAVAILABLE);

dlls/advapi32/tests/eventlog.c

@@ -73,6 +73,11 @@ static void test_open_close(void)
     ok(GetLastError() == ERROR_INVALID_HANDLE, "Expected ERROR_INVALID_HANDLE, got %d\n", GetLastError());
     }
 
+    /* Empty servername should be read as local server */
+    handle = OpenEventLogA("", "Application");
+    ok(handle != NULL, "Expected a handle\n");
+    CloseEventLog(handle);
+
     handle = OpenEventLogA(NULL, "Application");
     ok(handle != NULL, "Expected a handle\n");
     CloseEventLog(handle);