luci-app-ssr-plus: display log when enable socks5 server only

package/lean/luci-app-ssr-plus/Makefile

@@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=luci-app-ssr-plus
 PKG_VERSION:=175
-PKG_RELEASE:=4
+PKG_RELEASE:=5
 
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)
 

package/lean/luci-app-ssr-plus/luasrc/model/cbi/shadowsocksr/log.lua

@@ -1,17 +1,20 @@
+local fs = require "nixio.fs"
+
 f = SimpleForm("logview")
-f.reset = false
-f.submit = false
+
 t = f:field(TextValue, "conf")
 t.rmempty = true
 t.rows = 20
 function t.cfgvalue()
-local logs = luci.util.execi("cat /tmp/ssrplus.log")
-local s = ""
-for line in logs do
-s = line .. "\n" .. s
-end
-return s
+  if fs.access("/tmp/ssrplus.log") then
+    local logs = luci.util.execi("cat /tmp/ssrplus.log")
+    local s = ""
+    for line in logs do
+      s = line .. "\n" .. s
+      end
+    return s
+  end
 end
 t.readonly="readonly"
 
-return f
+return f