[ADQL] Replace a String.isEmpty() (Java 6) by String.length()==0 (Java 1.5).

src/adql/parser/ADQLParser.java

@@ -389,7 +389,7 @@ public class ADQLParser implements ADQLParserConstants {
 
                 try{
 
-                        if (file == null || file.isEmpty())
+                        if (file == null || file.length()==0)
                                 parser = new ADQLParser(System.in);
                         else if (file.matches(urlRegex))
                                 parser = new ADQLParser((new java.net.URL(file)).openStream());

src/adql/parser/adqlGrammar.jj

@@ -433,7 +433,7 @@ public class ADQLParser {
 
 		try{
 
-			if (file == null || file.isEmpty())
+			if (file == null || file.length()==0)
 				parser = new ADQLParser(System.in);
 			else if (file.matches(urlRegex))
 				parser = new ADQLParser((new java.net.URL(file)).openStream());