Handle edge case for initialized chain #3103
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What was wrong?
Closes #1149
The time based gas price strategy assumes there are many blocks to sample from. In cases where test chains are spun up and no blocks have been mined, this can throw exceptions for folks who are running tests.
How was it fixed?
Check the latest block prior to attempting to sample so it can fallback to the gas price in
w3.eth.gas_price.Todo:
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