fix: handle clipboard Error when image is in clipboard (#196)

Catch Error (e.g. IllegalAccessError from JAI's PNMImageWriter) thrown
during clipboard inspection in PasteAction.isEnabled(), log a warning,
and return false instead of crashing the Admin UI on login.

Signed-off-by: Joshua Dowell <joshua.dowell@centrallogic.com>

Author: Joshua Dowell

client/src/com/mirth/connect/client/ui/actions/PasteAction.java

@@ -17,11 +17,15 @@
 
 import javax.swing.AbstractAction;
 
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
 import com.mirth.connect.client.ui.components.MirthTextInterface;
 
 /** Allows for Pasting in text components. */
 public class PasteAction extends AbstractAction {
 
+    private static final Logger logger = LogManager.getLogger(PasteAction.class);
     MirthTextInterface comp;
 
     public PasteAction(MirthTextInterface comp) {
@@ -46,6 +50,9 @@ public boolean isEnabled() {
                 return false;
             } catch (IllegalStateException e) {
                 return false;
+            } catch (Error e) {
+                logger.warn("Could not check clipboard contents.", e);
+                return false;
             }
         } else {
             return false;