8368606: Printer lookup returns empty on AIX platform due to uninitialized results list

Backport-of: 9b1633ded0e1d952ef13c054b6c507149d22f8cd

Author: Ravi-Patel8

src/java.desktop/unix/classes/sun/print/PrintServiceLookupProvider.java

@@ -876,12 +876,16 @@ static String[] execCmd(final String command) {
                     FileReader reader = new FileReader(f);
                     bufferedReader = new BufferedReader(reader);
                     String line;
+                    results = new ArrayList<>();
                     while ((line = bufferedReader.readLine())
                            != null) {
                         results.add(line);
                     }
                 }
-            } finally {
+            } catch (Exception e) {
+                // Print exception for tracking printer command errors
+                IPPPrintService.debug_println("Printer command error: " + e);
+           } finally {
                 f.delete();
                 // promptly close all streams.
                 if (bufferedReader != null) {