Hide null params in parameter-list

client/components/parameter-list.js

@@ -12,20 +12,24 @@ const component = {
   view: vnode => {
     const device = vnode.attrs.device;
 
-    const rows = Object.values(vnode.attrs.parameters).map(parameter =>
-      m(
-        "tr",
-        m("th", parameter.label),
-        m(
-          "td",
-          m(
+    const rows = Object.values(vnode.attrs.parameters).map(parameter => {
+      const p = m(
         components.get(parameter.type || "parameter"),
         getChildAttrs(parameter, device)
-          )
-        )
-      )
       );
 
+      return m(
+        "tr",
+        {
+          onupdate: vn => {
+            vn.dom.style.display = p.dom ? "" : "none";
+          }
+        },
+        m("th", parameter.label),
+        m("td", p)
+      );
+    });
+
     return m("table.parameter-list", rows);
   }
 };

client/components/parameter.js

@@ -47,6 +47,8 @@ const component = {
       store.getTimestamp()
     );
 
+    if (value == null) return null;
+
     let edit;
     if (device[parameter] && device[parameter].writable)
       edit = m(