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Please look at the following sentence.

Your Say, published every Friday,enables readers to express opinions on a topic or issue raised by the editor.

There is no article before "issue".
I think the meaning of issue is definitely different from that of "topic".
Then, does "a topic or issue" means one thing?

Thank you for your answer in advance.
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'A topic or issue' - 'a topic or (an) issue.
Comments  
In the case " a banana or an apple", we can't omit the second article.

but in that case " a topic or (an) issue", can we omit the second article? Could you teach me a little bit more? Thank you for your answer in advance.