[geary/mjog/1050-invalid-server-name] Components.NetworkAddressValidator: Add debug log when DNS lookup fails

[Michael Gratton <mjog src gnome org>]

commit 41603e0a409dba795b014aee6129c3223af0b9c5
Author: Michael Gratton <mike vee net>
Date:   Thu Oct 29 23:33:36 2020 +1100

    Components.NetworkAddressValidator: Add debug log when DNS lookup fails

 src/client/components/components-validator.vala | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/src/client/components/components-validator.vala b/src/client/components/components-validator.vala
index 16f256b58..4d31dc505 100644
--- a/src/client/components/components-validator.vala
+++ b/src/client/components/components-validator.vala
@@ -485,6 +485,10 @@ public class Components.NetworkAddressValidator : Validator {
                         } catch (GLib.IOError.CANCELLED err) {
                             this.validated_address = null;
                         } catch (GLib.Error err) {
+                            debug(
+                                "Error in address lookup during validation: %s",
+                                err.message
+                            );
                             this.validated_address = null;
                             update_state(Validator.Validity.INVALID, reason);
                         }