Implement empty iterable handling and its corresponding tests in batchrunner.py file.

[Sahil-Chhoker]

Summary

Fixed the handling of empty iterables in _make_model_kwargs. Now raises a ValueError when an empty list is passed.

Bug / Issue

Closes #2108.
Empty iterables weren't properly handled.

Implementation

• Updated _make_model_kwargs to raise a ValueError for empty iterables.
• added a new function test_batch_run_with_params_with_empty_content() for testing.

[github-actions]

Performance benchmarks:

Model	Size	Init time [95% CI]	Run time [95% CI]
BoltzmannWealth	small	🔵 -1.4% [-2.2%, -0.8%]	🔵 -0.9% [-1.2%, -0.6%]
BoltzmannWealth	large	🔵 -1.0% [-1.7%, -0.3%]	🟢 -4.8% [-5.9%, -3.8%]
Schelling	small	🔵 -0.1% [-0.3%, +0.2%]	🔴 +81.3% [+80.4%, +82.2%]
Schelling	large	🔵 -0.9% [-1.3%, -0.5%]	🔴 +82.9% [+80.3%, +85.4%]
WolfSheep	small	🔵 +0.9% [+0.6%, +1.2%]	🔵 +1.1% [+0.9%, +1.3%]
WolfSheep	large	🔵 +0.3% [-1.3%, +1.7%]	🔵 +3.6% [+0.5%, +7.2%]
BoidFlockers	small	🔵 +0.2% [-0.2%, +0.6%]	🔵 +1.0% [+0.1%, +1.9%]
BoidFlockers	large	🔵 +0.4% [-0.3%, +1.1%]	🔵 -0.0% [-0.6%, +0.6%]

[quaquel]

Please start this PR from a clean branch, so without the changes to the Schelling example.

[Sahil-Chhoker]

Sorry for the inconvenience, @quaquel. A new branch with the required changes has been reopened.