Crash if non dict variables are overwritten with dict values in configs.

[mschuwalow]

Sacred 0.74 crashes if a non dictionary variable is defined in a config and later overwritten by a dictionary variable in another config.

This works:
##################################################################
from sacred import Experiment

ex = Experiment('hello_config')

@ex.config
def rude():
recipient = "bastard"
message = "Fuck off you {}!".format(recipient)
test_var = {}

@ex.config
def cfg(test_var):
test_var = {'1': 1}
recipient = "world"
message = "Hello {}!".format(recipient)

@ex.automain
def main(message):
print(name)
print(message)
#######################################################

And this doesn't:
########################################################
from sacred import Experiment

ex = Experiment('hello_config')

@ex.config
def rude():
recipient = "bastard"
message = "Fuck off you {}!".format(recipient)
test_var = 1

@ex.config
def cfg(test_var):
test_var = {'1': 1}
recipient = "world"
message = "Hello {}!".format(recipient)

@ex.automain
def main(message):
print(name)
print(message)
########################################################

The cause seems to be at

sacred/sacred/config/utils.py

Lines 89 to 94 in 416f46f

	def recursive_fill_in(config, preset):
	for key in preset:
	if key not in config:
	config[key] = preset[key]
	elif isinstance(config[key], dict):
	recursive_fill_in(config[key], preset[key])

.