[LNT] Fixed JS error caused by selecting the function with missing counters on the profile page

[kpdev42]

Summary

Some counters may be missing for some functions. These functions are labeled as no data on the Profile page.
You will get the JS error value.toFixed is not a function after selecting such function and the control flow graph.
This patch fixes this error.

OS Laboratory. Huawei Russian Research Institute. Saint-Petersburg

[thopre]

LGTM, thanks!

lnt/server/ui/static/lnt_profile.js

function CFGBasicBlock (instructions, fallThruInstruction, cfg) {
     this.instructions = instructions;
     this.address = instructions[0].address;
     var gjt = this.instructionParser
         .getJumpTargets(instructions[instructions.length-1], fallThruInstruction, this.cfg);
     this.targets = gjt[1];
     this.noFallThru = gjt[0];
     this.weight = this.instructions
         .reduce(function (a,b) {
-            var weight_a = (a.weight === undefined)?a:a.weight;
-            var weight_b = (b.weight === undefined)?b:b.weight;
+            var weight_a = (a.weight === undefined)?0:a.weight;
+            var weight_b = (b.weight === undefined)?0:b.weight;
             return weight_a+weight_b;
         }, 0);
 };
 
 function CFGEdge (bb_from, bb_to) {
     this.from = bb_from;
     this.to = bb_to;
 };