luci-mod-system: ignore empty /proc/mtd on flash page

A present, but empty /proc/mtd causes validation on the flash page to fail,
preventing any other operation.

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

1 files changed, 11 insertions, 6 deletions

diff --git a/modules/luci-mod-system/htdocs/luci-static/resources/view/system/flash.js b/modules/luci-mod-system/htdocs/luci-static/resources/view/system/flash.js
index 4a1058d0d9..3f28680389 100644
--- a/modules/luci-mod-system/htdocs/luci-static/resources/view/system/flash.js
+++ b/modules/luci-mod-system/htdocs/luci-static/resources/view/system/flash.js
@@ -385,16 +385,21 @@ return view.extend({
 		o.onclick = L.bind(this.handleRestore, this);
 
 
-		if (procmtd.length) {
+		var mtdblocks = [];
+		procmtd.split(/\n/).forEach(function(ln) {
+			var match = ln.match(/^mtd(\d+): .+ "(.+?)"$/);
+			if (match)
+				mtdblocks.push(match[1], match[2]);
+		});
+
+		if (mtdblocks.length) {
 			o = s.option(form.SectionValue, 'actions', form.NamedSection, 'actions', 'actions', _('Save mtdblock contents'), _('Click "Save mtdblock" to download specified mtdblock file. (NOTE: THIS FEATURE IS FOR PROFESSIONALS! )'));
 			ss = o.subsection;
 
 			o = ss.option(form.ListValue, 'mtdselect', _('Choose mtdblock'));
-			procmtd.split(/\n/).forEach(function(ln) {
-				var match = ln.match(/^mtd(\d+): .+ "(.+?)"$/);
-				if (match)
-					o.value(match[1], match[2]);
-			});
+
+			for (var i = 0; i < mtdblocks.length; i += 2)
+				o.value(mtdblocks[i], mtdblocks[i+1]);
 
 			o = ss.option(form.Button, 'mtddownload', _('Download mtdblock'));
 			o.inputstyle = 'action important';