Using Wildcard field with Float type

[F4I-E]

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Hello! I'm trying to marshal a structure containing random key string and float value like this:
{'key_1': 12.5, 'key_2': 42.5, 'key_2': 68.1}

But I have an error: "float() argument must be a string or a number, not 'NoneType' "
The question: Is it not allowable to marshal such a structure or it's an issue?

Additional context
I'm using python v.3.7 and flask-restx v.0.2.0

The code I'm trying to run:

from flask_restx import fields, marshal

wild = fields.Wildcard(fields.Float)
wildcard_fields ={'*': wild}
data = {'John': 12.1, 'bob': 42.2, 'Jane': 68.01}
json.dumps(marshal(data, wildcard_fields))

The error is:

TypeError                                 Traceback (most recent call last)
<ipython-input-324-7d964210af16> in <module>
----> 1 json.dumps(marshal(data, wildcard_fields))

.../lib/python3.7/site-packages/flask_restx/marshalling.py in marshal(data, fields, envelope, skip_none, mask, ordered)
     90                         value = field.output(dkey, data, ordered=ordered)
     91                         if value is None or value == field.container.format(
---> 92                             field.default
     93                         ):
     94                             break

.../lib/python3.7/site-packages/flask_restx/fields.py in format(self, value)
    473     def format(self, value):
    474         try:
--> 475             return float(value)
    476         except ValueError as ve:
    477             raise MarshallingError(ve)

TypeError: float() argument must be a string or a number, not 'NoneType'

[TVLIgnacy]

I've got this exact same issue. I've tracked it down to the error being field.container.format(field.default), which passes None (the Wildcard field's default value), into the Float's format function, which tries to parse it and crashes.

The simplest solution (pending the pull request) is to set the default value of the Wildcard explicitly to a reasonable default value for your code, such as -1
The following snippet below works correctly:

from flask_restx import fields, marshal

wild = fields.Wildcard(fields.Float, default = -1)
wildcard_fields ={'*': wild}
data = {'John': 12.1, 'bob': 42.2, 'Jane': 68.01}
json.dumps(marshal(data, wildcard_fields))

[j5awry]

Fixed in #327 . If not, please re-open with new information.