Catch null host exception in discovery service (#17924)

Signed-off-by: Michael Lobstein <michael.lobstein@gmail.com>

bundles/org.openhab.binding.bondhome/src/main/java/org/openhab/binding/bondhome/internal/api/BondHttpApi.java

@@ -244,7 +244,7 @@ public class BondHttpApi {
 
                 logger.debug("HTTP response from request to {}: {}", uri, httpResponse);
                 return httpResponse;
-            } catch (InterruptedException | TimeoutException | ExecutionException e) {
+            } catch (InterruptedException | TimeoutException | ExecutionException | IllegalArgumentException e) {
                 logger.debug("Last request to Bond Bridge failed; {} retries remaining: {}", numRetriesRemaining,
                         e.getMessage());
                 numRetriesRemaining--;