Static maps fail silently and produces malformed data

[vakker]

Please be sure to include as much information as possible:

Environment details

1. Specify the API at the beginning of the title (for example, "Places: ..."): static maps
2. OS type and version
3. Library version and other environment information: latest master

Steps to reproduce

1. Request static maps that fail (e.g. wrong API key)
2. Iterate the response

Code example

client = googlemaps.Client(key="asd")
response = client.static_map(
                size=(640, 640),
                zoom=zoom,
                center=center,
                maptype="satellite",
                format="png",
                scale=1,
            )

for r in response:
    print(r)

Output

b'T' b'he ' b'G' b'oo' b'gl' b'e ' b'M' b'ap' b's ' b'P' b'la' b't' b'fo' b'rm' b' s' b'er' b've' b'r ' b're' b'je' b'ct' b'ed' b' ' b'yo' b'u' b'r re' b'q' b'ue' b'st' b'. ' b'T' b'he ' b'pr' b'ov' b'i' b'd' b'ed ' b'AP' b'I ' b'k' b'ey' b' i' b's ' b'i' b'nv' b'a' b'li' b'd.' b' '

Since the static maps function passes in it's own extract_body function to _request, the error checking doesn't happen.
See here.

Possible solution: #446