Various cosmetic fixes in host and flow pages

Service map is not reported when there are no services listed

scripts/lua/modules/page_utils.lua

@@ -234,14 +234,17 @@ function page_utils.safe_html(s)
       return ''
    end
 
-   return string.gsub(s, "[}{\">/<'&]", {
-			 ["&"] = "&amp;",
-			 ["<"] = "&lt;",
-			 [">"] = "&gt;",
-			 ['"'] = "&quot;",
-			 ["'"] = "&#39;",
-			 ["/"] = "&#47;"
+   ret = string.gsub(s, "[}{\">/<'&]",
+		     {
+			["&"] = "&amp;",
+			["<"] = "&lt;",
+			[">"] = "&gt;",
+			['"'] = "&quot;",
+			["'"] = "&#39;",
+			["/"] = "&#47;"
    })
+   
+   return(ret)
 end
 
 -- #################################