Do not try to print text if no more text is available

Since `fill_formatted_text_box` is changing the `y` state of the
document even if you do not print anything (box.leading is subtracted)
calling this will cause a wrong leading for any paragraphs which have
only one single line.

lib/prawn/text.rb

@@ -208,8 +208,10 @@ def formatted_text(array, options = {})
             end
           end
 
-          remaining_text = fill_formatted_text_box(remaining_text, options)
-          draw_remaining_formatted_text_on_new_pages(remaining_text, options)
+          unless @all_text_printed
+            remaining_text = fill_formatted_text_box(remaining_text, options)
+            draw_remaining_formatted_text_on_new_pages(remaining_text, options)
+          end
         end
       else
         remaining_text = fill_formatted_text_box(array, options)

spec/text_spec.rb

@@ -445,6 +445,17 @@
       expect(x_positions[3]).to eq(0)
     end
 
+    describe "when paragraph has only one line, it should not add" \
+             " additional leading" do
+      let(:leading) { 100 }
+
+      it 'should add leading only once' do
+        _y = @pdf.y
+        @pdf.text("hello", indent_paragraphs: 10, leading: leading)
+        expect(_y - @pdf.y).to be < leading*2
+      end
+    end
+
     describe "when wrap to new page, and first line of new page" \
              " is not the start of a new paragraph, that line should" \
              " not be indented" do