rpm: Use Collection isEmpty

Change-Id: Ia5106686dd07f334cf5e9c50d00277177aa3dac6
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>
Reviewed-on: https://git.eclipse.org/r/c/linuxtools/org.eclipse.linuxtools/+/184071
Tested-by: Linux Tools Bot <linuxtools-bot@eclipse.org>
diff --git a/rpm/org.eclipse.linuxtools.rpm.ui.editor/src/org/eclipse/linuxtools/internal/rpm/ui/editor/Activator.java b/rpm/org.eclipse.linuxtools.rpm.ui.editor/src/org/eclipse/linuxtools/internal/rpm/ui/editor/Activator.java
index e7ec6d1..b12938f 100644
--- a/rpm/org.eclipse.linuxtools.rpm.ui.editor/src/org/eclipse/linuxtools/internal/rpm/ui/editor/Activator.java
+++ b/rpm/org.eclipse.linuxtools.rpm.ui.editor/src/org/eclipse/linuxtools/internal/rpm/ui/editor/Activator.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2007, 2018 Red Hat, Inc.
+ * Copyright (c) 2007, 2021 Red Hat, Inc.
  *
  * This program and the accompanying materials are made
  * available under the terms of the Eclipse Public License 2.0
@@ -103,7 +103,7 @@
 	}
 
 	public RpmPackageProposalsList getRpmPackageList() {
-		if (packagesList == null || packagesList.getProposals("").size() == 0) { //$NON-NLS-1$
+		if (packagesList == null || packagesList.getProposals("").isEmpty()) { //$NON-NLS-1$
 			packagesList = new RpmPackageProposalsList();
 		}
 		return packagesList;