diff --git a/src/dashboards/pcp-vector-container-overview.json b/src/dashboards/pcp-vector-container-overview.json
index a1a75c2..a674d74 100644
--- a/src/dashboards/pcp-vector-container-overview.json
+++ b/src/dashboards/pcp-vector-container-overview.json
@@ -127,7 +127,7 @@
           "format": "percentunit",
           "label": null,
           "logBase": 1,
-          "max": "1",
+          "max": null,
           "min": "0",
           "show": true
         },
diff --git a/src/datasources/lib/datasource_base.ts b/src/datasources/lib/datasource_base.ts
index db0167b..4bca9c0 100644
--- a/src/datasources/lib/datasource_base.ts
+++ b/src/datasources/lib/datasource_base.ts
@@ -150,7 +150,11 @@ export abstract class PmapiDatasourceBase<EP extends Endpoint> {
                     container: container,
                     endpoint: this.getOrCreateEndpoint(url, container)
                 };
-            });
+            })
+            // getConnectionParams only processes target.container if it is not blank
+            // the only case when container is "" is because it was $container, but the
+            // $container dashboard variable is empty (viewing "all" containers, but none exists)
+            .filter(target => target.container !== "");
     }
 
     async applyTransformations(pmapiSrv: PmapiSrv, results: TargetResult) {