Mention the case that `render` will return nil if given `:collection` is nil or empty when rendering partial.
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@ -75,6 +75,11 @@ module ActionView
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#
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# <%= render :partial => "ad", :collection => @advertisements, :spacer_template => "ad_divider" %>
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#
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# If the given <tt>:collection</tt> is nil or empty, <tt>render</tt> will return nil. This will allow you
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# to specify a text which will displayed instead by using this form:
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#
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# <%= render(:partial => "ad", :collection => @advertisements) || "There's no ad to be displayed" %>
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#
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# NOTE: Due to backwards compatibility concerns, the collection can't be one of hashes. Normally you'd also
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# just keep domain objects, like Active Records, in there.
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#
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