fix(router.py): raise better exception when no deployments are available

Fixes https://github.com/BerriAI/litellm/issues/3355

litellm/router.py

@@ -1450,7 +1450,9 @@ class Router:
                 raise original_exception
             ### RETRY
             #### check if it should retry + back-off if required
-            if "No models available" in str(e):
+            if "No models available" in str(
+                e
+            ) or RouterErrors.no_deployments_available.value in str(e):
                 timeout = litellm._calculate_retry_after(
                     remaining_retries=num_retries,
                     max_retries=num_retries,
@@ -2948,6 +2950,11 @@ class Router:
                 model=model, healthy_deployments=healthy_deployments, messages=messages
             )
 
+        if len(healthy_deployments) == 0:
+            raise ValueError(
+                f"{RouterErrors.no_deployments_available.value}, passed model={model}"
+            )
+
         if (
             self.routing_strategy == "usage-based-routing-v2"
             and self.lowesttpm_logger_v2 is not None