Fix NaN JSON error.

app.py

@@ -1,6 +1,7 @@
 from flask import Flask
 from flask_restful import Resource, Api, reqparse
 import pandas as pd
+import numpy as np
 import ast
 import kiss
 import glob
@@ -22,15 +23,12 @@ class Locations(Resource):
 # Read some log files
 list_stacked = pd.DataFrame()
 file_list = glob.glob("logs/*.log")
-print(file_list)
+#print(file_list)
 for file in file_list:
     file1 = pd.read_csv(file)
     list_stacked = pd.concat([list_stacked, file1])
-
-# TODO get rid of NaN in JSON data? Either blank them or wrap in quotes.
-# https://jsoneditoronline.org
-# SyntaxError: JSON.parse: unexpected character at line 8818 column 20 of the JSON data
-#             "104": NaN,
+# TODO Can we do this without numpy?
+list_stacked.replace(np.nan, 0, inplace=True)
 
 # TODO do I need to rearrange the data to a different format? I want all the
 # data for one packet (one row) together.