Add debug to pnalib to find why something fails

pnalib.py

 import json
 
 def get_jsonp_file(url, temp_fname, use_old, allow_old=True):
-    return get_file(url, temp_fname, use_old, jsonp_load, allow_old)
+    try:
+        return get_file(url, temp_fname, use_old, jsonp_load, allow_old)
+    except json.decoder.JSONDecodeError as e:
+        print("Failed to parse JSON from {}".format(temp_fname))
+        raise
 
 def get_json_file(url, temp_fname, use_old, allow_old=True):
-    return get_file(url, temp_fname, use_old, json.load, allow_old)
+    try:
+        return get_file(url, temp_fname, use_old, json.load, allow_old)
+    except json.decoder.JSONDecodeError as e:
+        print("Failed to parse JSON from {}".format(temp_fname))
+        raise
 
 def jsonp_load(fp):
     return json.loads(fp.read()[1:-2])