[LNT] Remove dead code

[thopre]

Summary

Remove 2 blocks of dead code in LNT:

• safediv() method which is not used anywhere
• setting of derive_stat attribute of a MatrixDataRequest which is not used by anything.

[hubert.reinterpretcast]

LGTM.

lnt/server/ui/util.py

 import colorsys
 import math
 import re
 from lnt.server.reporting.analysis import REGRESSED
 
 from flask import g
 
 
 def toColorString(col):
     r, g, b = [clamp(int(v * 255), 0, 255)
                for v in col]
     return "#%02x%02x%02x" % (r, g, b)
 
 
-def safediv(a, b, default=None):
-    try:
-        return a / b
-    except ZeroDivisionError:
-        return default
-
-
 def makeDarkerColor(h):
     return makeDarkColor(h, 0.50)
 
 
 def makeDarkColor(h, v=0.8):
     h = h % 1.
     s = 0.95
     return colorsys.hsv_to_rgb(h, 0.9 + s * .1, v)

lnt/server/ui/views.py

for req in data_parameters:
                 q = q.limit(limit)
 
         req.samples = defaultdict(list)
 
         for s in q.all():
             req.samples[s[1]].append(s[0])
             all_orders.add(s[1])
             order_to_id[s[1]] = s[2]
-        req.derive_stat = {}
-        for order, samples in req.samples.items():
-            req.derive_stat[order] = mean(samples)
     if not all_orders:
         abort(404, "No data found.")
     # Now grab the baseline data.
     user_baseline = baseline()
     backup_baseline = next(iter(all_orders))
     if user_baseline:
         all_orders.add(user_baseline.order.llvm_project_revision)
         baseline_rev = user_baseline.order.llvm_project_revision