Paratext: Fix \qs parsing

When converting to non-Paratext formats, `\qs` is treated as paragraph
style instead of character style. Therefore, whitespace before it needs
to be normalized.

This normalization failed with ArrayIndexOutOfBoundsException in case
the `\qs` was the first element of its parent element.

biblemulticonverter/src/main/java/biblemulticonverter/format/paratext/ParatextBook.java

@@ -154,7 +154,7 @@ private void fixTrailingWhitespace(ParatextCharacterContentContainer cc) {
 				if (!suffix.isEmpty()) {
 					cc.getContent().add(i + 1, Text.from(suffix));
 				}
-				if (((AutoClosingFormatting) cc.getContent().get(i)).getKind().getLineBreakKind() == ExtendedLineBreakKind.SAME_LINE_IF_POSSIBLE) {
+				if (i > 0 && ((AutoClosingFormatting) cc.getContent().get(i)).getKind().getLineBreakKind() == ExtendedLineBreakKind.SAME_LINE_IF_POSSIBLE) {
 					ParatextCharacterContentPart last = cc.getContent().get(i-1);
 					if (last instanceof AutoClosingFormatting) {
 						extractTrailingWhitespace((AutoClosingFormatting) last);