Add fallback parameter support to config() #182
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This PR adds an optional fallback parameter to the config() call in decouple.py.
1.If a configuration key is missing and no default is given, fallback will be returned instead of raising an error.
2.fallback is returned as-is (no casting), which makes it different from default.
3.Existing behavior remains unchanged when fallback is not used.
4.The change is fully backward compatible and limited to a single file.
Example:
from decouple import config
value = config("MISSING_KEY", fallback="Backup Value")
This is useful for development, testing, or optional settings where missing environment variables should not cause the application to crash.