Handle no oracle box present on oracle joining/starting a pool + other discovered bugs

[greenhat]

Discovered in the latest iteration on #61

Also discovered:

• Close Accidental burn of reward tokens for oracles(one for each) in bootstrap #114
• Close Missing (collected oracle boxes * 1 reward token) transfer to collector on pool refresh #115
• Close Preserve ballot box value on voting #116
• Close Missing token burn permit for old reward tokens on update pool command #117

[coveralls]

Pull Request Test Coverage Report for Build 3095704962

• 44 of 162 (27.16%) changed or added relevant lines in 19 files are covered.
• 16 unchanged lines in 9 files lost coverage.
• Overall coverage increased (+0.3%) to 69.959%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
core/src/cli_commands/print_reward_tokens.rs	0	1	0.0%
core/src/cli_commands/vote_update_pool.rs	8	10	80.0%
core/src/pool_commands/test_utils.rs	8	10	80.0%
core/src/main.rs	0	4	0.0%
core/src/scans.rs	0	4	0.0%
core/src/state.rs	0	4	0.0%
core/src/actions.rs	0	6	0.0%
core/src/api.rs	0	7	0.0%
core/src/node_interface.rs	0	7	0.0%
core/src/pool_commands.rs	0	7	0.0%

Files with Coverage Reduction	New Missed Lines	%
core/src/cli_commands/extract_reward_tokens.rs	1	75.86%
core/src/cli_commands/transfer_oracle_token.rs	1	71.79%
core/src/main.rs	1	0%
core/src/node_interface.rs	1	0%
core/src/pool_commands.rs	1	0%
core/src/state.rs	1	0%
core/src/box_kind/ballot_box.rs	2	88.04%
core/src/api.rs	3	0%
core/src/oracle_state.rs	5	0%

Totals
Change from base Build 3088268486:	0.3%
Covered Lines:	2380
Relevant Lines:	3402

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💛 - Coveralls

[kettlebell]

Looks great, I could not find a fault! I liked how you used commits to link to particular issues. A neat trick that I'll look to use in the future.