slapos_parameter_editor: Ensure software type is set for raw parameter

  If failover textarea is rendered, we ensure that at least the software type is set, in case it exists.

   This prevents bad software.cfg.json break the form while editing some instance.

master/bt5/slapos_parameter_editor/SkinTemplateItem/portal_skins/slapos_parameter_editor/gadget_erp5_page_slap_parameter_form.js.js

@@ -194,6 +194,38 @@
     }
 
     return g.renderSubForm("", {}, {}, true)
+      .push(function () {
+        var input = g.element.querySelector('select.slapos-software-type'),
+          parameter_shared = g.element.querySelector('input.parameter_shared'),
+          shared = g.state.shared,
+          softwaretype = g.state.softwaretype,
+          editable = g.state.editable,
+          option;
+
+        // re-enforce readonly if it was not set before.
+        if (!editable || g.state.restricted_softwaretype === true) {
+          input.classList.add("readonly");
+          input["aria-disabled"] = "true";
+          input["tab-index"] = "-1";
+        }
+
+        // Field failed too early, so nothing was included, in this case
+        // we forcefully include the default option it exists.
+        if ((input.children.length === 0) && (softwaretype !== undefined)) {
+          option = domsugar("option", {
+            text: softwaretype,
+            value: softwaretype,
+            selected: true
+          });
+          option['data-id'] = softwaretype;
+          option['data-index'] = 999;
+          option['data-shared'] = shared;
+          if (shared !== undefined) {
+            parameter_shared.value = shared;
+          }
+          input.appendChild(option);
+        }
+      })
       .push(function () {
         // Do not hide the Software type, let the user edit it.
         failover_div = domsugar(failover_div, {}, [