[PR #9963/34b6fb74 backport][stable-9] proxmox_disk: fail gracefully if storage hasn't been provided by the user (#9967)

proxmox_disk: fail gracefully if storage hasn't been provided by the user (#9963)

Fail gracefully if storage hasn't been provided by the user.

(cherry picked from commit 34b6fb74eb)

Co-authored-by: Felix Fontein <felix@fontein.de>

plugins/modules/proxmox_disk.py

@@ -567,6 +567,8 @@ class ProxmoxDiskAnsible(ProxmoxAnsible):
                 ok_str = "CD-ROM was created on %s bus in VM %s"
             else:
                 config_str = self.module.params["storage"]
+                if not config_str:
+                    self.module.fail_json(msg="The storage option must be specified.")
                 if self.module.params.get("media") != "cdrom":
                     config_str += ":%s" % (self.module.params["size"])
                 ok_str = "Disk %s created in VM %s"