Update otel_collector_config.yml.j2

roles/opentelemetry_collector/templates/otel_collector_config.yml.j2

@@ -1,13 +1,23 @@
+{% if otel_collector_receivers is defined and otel_collector_receivers | length > 0 %}
 receivers:
 {{ otel_collector_receivers | to_nice_yaml(indent=2) | indent(2, true) }}
+{% endif %}
+{% if otel_collector_processors is defined and otel_collector_processors | length > 0 %}
 processors:
 {{ otel_collector_processors | to_nice_yaml(indent=2) | indent(2, true) }}
+{% endif %}
+{% if otel_collector_exporters is defined and otel_collector_exporters | length > 0 %}
 exporters:
 {{ otel_collector_exporters | to_nice_yaml(indent=2) | indent(2, true) }}
+{% endif %}
+{% if otel_collector_extensions is defined and otel_collector_extensions | length > 0 %}
 extensions:
 {{ otel_collector_extensions | to_nice_yaml(indent=2) | indent(2, true) }}
+{% endif %}
+{% if otel_collector_service is defined and otel_collector_service | length > 0 %}
 service:
 {{ otel_collector_service | to_nice_yaml(indent=2) | indent(2, true) }}
+{% endif %}
 {% if otel_collector_connectors is defined and otel_collector_connectors | length > 0 %}
 connectors:
 {{ otel_collector_connectors | to_nice_yaml(indent=2) | indent(2, true) }}