(Fix) Read only owners on xDai and Volta

[Agupane]

Closes #1685 by:

• Avoid updating the store when the result of the batch transaction is not defined
• This error appears only on xDai or Volta, couldn't find a way to reproduce this on Mainnet or Rinkeby

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CLA Assistant Lite All Contributors have signed the CLA.

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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[ghost]

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[ghost]

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[ghost]

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[ghost]

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[ghost]

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[nicosampler]

seems to be working fine:
https://www.loom.com/share/11c224840f7c4a0fa44ea1d740fcdb08

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ESLint Summary View Full Report

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

---

^{Report generated by eslint-plus-action}

[ghost]

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[github-actions]

• Safe Multisig app rinkeby

[francovenica]

Looks good to me

Didn't suffer the "only read" mode after being around those environments for some time