Redis cache clear should error when not available

Author: mikevanwinkle

php/Terminus/Site.php

@@ -49,7 +49,11 @@ public function bindings($type=null) {
       }
     }
     if ($type) {
-      return $this->bindings[$type];
+      if (isset($this->bindings[$type])) {
+        return $this->bindings[$type];
+      } else {
+        return false;
+      }      
     }
     return $this->bindings;
   }

php/commands/site.php

@@ -1093,6 +1093,9 @@ public function redis($args, $assoc_args) {
     switch ($action) {
       case 'clear':
         $bindings = $site->bindings('cacheserver');
+        if (empty($bindings)) {
+          \Terminus::error("Redis cache not enabled");
+        }
         $commands = array();
         foreach($bindings as $binding) {
           if ( @$env AND $env != $binding->environment) continue;