gui: removes abort() in grid-obs if observer is empty #501

	name: Linux

	on:
	push:
	branches: [ master, test ]
	pull_request:
	branches: [ master, test ]

	env:
	TEST_OUTPUT_ON_FAILURE: 1
	CC: gcc-11
	CXX: g++-11

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	BUILD_TYPE: [Debug, RelWithDebInfo, Release]

	steps:
	- name: Checkout repository and submodule
	uses: actions/checkout@v2
	with:
	submodules: recursive

	- name: Install dependencies
	run: sudo apt-get update && sudo apt-get install build-essential gcc-11 g++-11 cmake libglew-dev libglfw3-dev libglx0 libopengl0 libgl1-mesa-dev

	- name: Configure CMake
	run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{matrix.BUILD_TYPE}}

	- name: Build
	run: cmake --build ${{github.workspace}}/build --config ${{matrix.BUILD_TYPE}}

	- name: Test
	working-directory: ${{github.workspace}}/build
	run: ctest -VV -C ${{env.BUILD_TYPE}} --rerun-failed --output-on-failure

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