Fix cell on maxNBlocksPerDay (3.X) (#142)

* Fix cell on maxNBlocksPerDay

uint (86400/15000*10000) equals 5000 but not 5760 because ```maxNBlocksPerDay``` is uint but not float.

* Delete incoverable code

Delete incoverable code since unint can't be <0,. For example: uint(-1) = uint 4294967295.

* Fix nBlocks == 0

Fix nBlocks == 0

CoreMetrics/CoreMetrics.cs

@@ -33,7 +33,7 @@ public void PostProcess(HttpContext context, string method, JArray _params, JObj
  private JObject GetBlocksTime(uint nBlocks, uint lastHeight)
  {
  // It is currently limited to query blocks generated in the last 24hours (86400 seconds)
- uint maxNBlocksPerDay = 86400 / Blockchain.MillisecondsPerBlock * 1000;
+ uint maxNBlocksPerDay = 86400 / (Blockchain.MillisecondsPerBlock / 1000);
  if (lastHeight != 0)
  {
  if (lastHeight >= Blockchain.Singleton.Height)
@@ -60,13 +60,13 @@ private JObject GetBlocksTime(uint nBlocks, uint lastHeight)
  JObject json = new JObject();
  return json["error"] = "Requested number of blocks timestamps " + nBlocks + " exceeds quantity of known blocks " + Blockchain.Singleton.Height;
  }
-
- if (nBlocks <= 0)
+ 
+ if (nBlocks == 0)
  {
  JObject json = new JObject();
- return json["error"] = "Requested number of block times can not be <= 0";
+ return json["error"] = "Requested number of block times can not be = 0";
  }
-
+ 
  JArray array = new JArray();
  uint heightToBegin = lastHeight > 0 ? lastHeight - nBlocks : (Blockchain.Singleton.Height - 1) - nBlocks;
  for (uint i = heightToBegin; i <= heightToBegin + nBlocks; i++)