Fix the minor issues commented by the owner

The owner review comments can be seen here:
https://github.com/formatc1702/WireViz/pull/62

src/wireviz/Harness.py

@@ -4,16 +4,11 @@
 from wireviz.DataClasses import Connector, Cable
 from graphviz import Graph
 from wireviz import wv_colors
-from wireviz.wv_helper import awg_equiv, mm2_equiv, tuplelist2tsv, nested, flatten2d
+from wireviz.wv_helper import awg_equiv, mm2_equiv, tuplelist2tsv, nested, flatten2d, index_if_list
 from collections import Counter
 from typing import List
 
 
-# Return the value indexed if it is a list, or simply the value otherwise.
-# TODO: Maybe move this to wv_helper?
-def index_if_list(value, index):
-    return value[index] if isinstance(value, list) else value
-
 class Harness:
 
     def __init__(self):
@@ -349,7 +344,6 @@ class Harness:
         # bundles (ignores wirecount)
         wirelist = []
         # list all cables again, since bundles are represented as wires internally, with the category='bundle' set
-        # TODO: Maybe rename bundle to cable or maybe loop only [c for c in self.cables.values() if c.category == 'bundle']
         for bundle in self.cables.values():
             if bundle.category == 'bundle':
                 # add each wire from each bundle to the wirelist

src/wireviz/wv_helper.py

@@ -65,3 +65,7 @@ def tuplelist2tsv(inp, header=None):
     for row in inp:
         output = output + '\t'.join(str(item) for item in row) + '\n'
     return output
+
+# Return the value indexed if it is a list, or simply the value otherwise.
+def index_if_list(value, index):
+    return value[index] if isinstance(value, list) else value