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ecpg: Catch zero-length Unicode identifiers correctly

The previous code to detect a zero-length identifier when usingUnicode identifiers such asexec sql select u&"";did not work. This fixes that.Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>Discussion:https://www.postgresql.org/message-id/flat/82fafa79-331c-9d65-e51b-8b5d1b2383fc%40enterprisedb.com

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Original file line number	Diff line number	Diff line change
`@@ -737,7 +737,7 @@ cppline{space}#([^i][A-Za-z]\|{if}\|{ifdef}\|{ifndef}\|{import})((\/\[^/]\+`
`737`	`737`	`}`
`738`	`738`	`<xui>{dquote}{`
`739`	`739`	`BEGIN(state_before_str_start);`
`740`		`-if (literallen ==2)/* "U&" */`
	`740`	`+if (literallen ==0)`
`741`	`741`	`mmerror(PARSE_ERROR, ET_ERROR,"zero-length delimited identifier");`
`742`	`742`	`/* The backend will truncate the identifier here. We do not as it does not change the result. */`
`743`	`743`	`base_yylval.str =psprintf("U&\"%s\"", literalbuf);`

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