sqlline.SqlLine#dequote fails with StringIndexOutOfBoundsException in case of odd number of quotes

[snuyanzin]

while testing #86 faced with the issue
0: jdbc:calcite:model=target/test-classes/mod> !set csvDelimiter '
fails with

java.lang.StringIndexOutOfBoundsException: begin 1, end 0, length 1
        at java.base/java.lang.String.checkBoundsBeginEnd(Unknown Source)
        at java.base/java.lang.String.substring(Unknown Source)
        at sqlline.SqlLine.dequote(SqlLine.java:1323)
        at sqlline.SqlLine.split(SqlLine.java:1336)
        at sqlline.SqlLine.split(SqlLine.java:1155)
        at sqlline.AbstractCommandHandler.matches(AbstractCommandHandler.java:65)
        at sqlline.SqlLine.dispatch(SqlLine.java:775)
        at sqlline.SqlLine.begin(SqlLine.java:669)
        at sqlline.SqlLine.start(SqlLine.java:374)
        at sqlline.SqlLine.main(SqlLine.java:266)

the solution might be to add checking non-one length for while cycle

    while (str.startsWith("'") && str.endsWith("'")
        || str.startsWith("\"") && str.endsWith("\"")) {
      str = str.substring(1, str.length() - 1);
    }

[julianhyde]

Fixed in c1bda8d, along with #50.