add fix to stop duplicating entries in find_readings_with_lights_on.

The function was originally looping through the set of readings for a
particular time-stamp. If there was more than one reading above 39, it
would append that particular time-stamp every time the if-statement
was true -- as it looped through each reading for said time-stamp.

This change adds a break and a variable to track if the time-stamp
should be added to the list -- after it has broke out of the
if-block.

src/services/data_services.py

@@ -36,9 +36,15 @@ def find_flickers(selected_readings, all_readings):
 
 def find_readings_with_lights_on(flicker_entries):
     filtered_readings = list()
+    add_to_list = False
     for time, reading in flicker_entries.items():
         for item in reading:
             val = int(item)
             if (val > 39):
-                filtered_readings.append( (time, reading) )
+                add_to_list = True
+                break
+            else:
+                add_to_list = False
+        if (add_to_list == True):
+            filtered_readings.append( (time, reading) )
     return filtered_readings