Remove ignore_errors from setup_sources/tasks/annex.yml

[ekohl]

The block with ignore_errors makes it hard to spot real errors vs expected errors:

obal/obal/data/roles/setup_sources/tasks/annex.yml

Lines 16 to 23 in c4161d1

	- name: 'Search annex for web link'
	shell: 'git annex whereis {{ setup_sources_sourcepath }} 2>/dev/null | grep -q "web:"'
	args:
	chdir: "{{ package_dir }}"
	changed_when: False
	register: setup_sources_search_annex
	ignore_errors: yes
	when: (not setup_sources_source_exists.stat.exists) or ( setup_sources_source_exists.stat.exists and setup_sources_source_exists.stat.islnk is defined and setup_sources_source_exists.stat.islnk )

In #94 an attempt was made to replace the failure with native ansible code.