try hide format option if exists only 1

app/UI/VmCreate/Sections/AdditionalDiskSection.php

@@ -44,7 +44,7 @@ class AdditionalDiskSection extends BaseSection implements ClientArea
             $this->addField($field);
         }
         //format
-        if($this->configuration()->isQemu()){
+        if($this->configuration()->isQemu() && count($this->configuration()->getAdditionalDiskFormat()) > 1){
             $field = new Select('additionalDiskFormat');
             $options=[];
             foreach( $this->configuration()->getAdditionalDiskFormat() as $entery){