luci-mod-network: fix device section cleanup

Ensure that device sections are only automatically removed after all
related options have been parsed, to avoid prematurely deleting sections.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

modules/luci-mod-network/htdocs/luci-static/resources/tools/network.js

@@ -145,24 +145,9 @@ function deviceWrite(section_id, formvalue) {
 }
 
 function deviceRemove(section_id) {
-	var ds = lookupDevSection(this.section, section_id, false),
+	var ds = lookupDevSection(this.section, section_id, false);
-	    sv = ds ? uci.get('network', ds) : null;
 
-	if (sv) {
-		var empty = true;
-
-		for (var opt in sv) {
-			if (opt.charAt(0) == '.' || opt == 'name' || opt == this.option)
-				continue;
-
-			empty = false;
-		}
-
-		if (empty)
-			uci.remove('network', ds);
-		else
 	uci.unset('network', ds, this.option);
-	}
 
 	if (this.migrate)
 		uci.unset('network', section_id, this.option);
@@ -188,6 +173,28 @@ function deviceRefresh(section_id) {
 	}
 }
 
+function sectionParse() {
+	var ds = lookupDevSection(this, this.section, false);
+
+	return form.NamedSection.prototype.parse.apply(this).then(function() {
+		var sv = ds ? uci.get('network', ds) : null;
+
+		if (sv) {
+			var empty = true;
+
+			for (var opt in sv) {
+				if (opt.charAt(0) == '.' || opt == 'name')
+					continue;
+
+				empty = false;
+			}
+
+			if (empty)
+				uci.remove('network', ds);
+	        }
+	});
+}
+
 
 var cbiTagValue = form.Value.extend({
 	renderWidget: function(section_id, option_index, cfgvalue) {
@@ -387,6 +394,9 @@ return baseclass.extend({
 		    o, ss;
 
 		if (isIface) {
+			if (!s.hasOwnProperty('parse'))
+				s.parse = sectionParse;
+
 			var type;
 
 			/* If an externally configured br-xxx interface already exists,