Bug report: QueryStakingSummary returns 0 when coins are staked

[mperklin]

Prerequisites

• I am running the latest CosmPy version.
• I checked the documentation and found no answer to my problem.
• I checked the existing issues to make sure my problem has not already been reported.
• I have read the code of conduct before creating this issue.

Expected Behavior

When executing client.query_staking_summary(some_address), I expect to receive a dict containing accurate total_rewards value and relevant current_positions.

Current Behavior

The total_rewards is 0.

When stepping through the code at https://github.com/fetchai/cosmpy/blob/master/cosmpy/aerial/client/__init__.py#L396 I identify that the reward_amount is accurate, however the // COSMOS_SDK_DEC_COIN_PRECISION floor division results in a value of 0.0.

Because the reward_amount is being divided by 10**18, the resultant output is 0 since 10**18 is greater than the base unit of the cosmoshub blockchain.

I think the // COSMOS_SDK_DEC_COIN_PRECISION may be unnecessary in this line of code, but I don't know the full context of how this is used across all blockchains.

A possible fix is to rewrite this line to simply be:
int(float(reward.amount))
without any division

To Reproduce

No response

Context

I instantiated a aerial client using the cosmoshub blockchain and requested staking details of an address that has > 1uatom of staking rewards.

Failure Logs

No response

[roson9527]

import cosmpy.aerial.client
cosmpy.aerial.client.__dict__["COSMOS_SDK_DEC_COIN_PRECISION"] = 1

I've also encountered the same issue. The current solution is to use the following code to set this constant and make the method return the correct result.