GP-3315 - Updated plugin restoring to verify the requested package

exists

Ghidra/Framework/Project/src/main/java/ghidra/framework/plugintool/util/PluginClassManager.java

@@ -199,6 +199,12 @@ public class PluginClassManager {
 				includedClasses.add(excludedClassName);
 			}
 
+			if (!PluginPackage.exists(packageName)) {
+				Msg.warn(this, "Unable to find plugin pacakge '" + packageName +
+					"' while restoring plugins from xml");
+				continue;
+			}
+
 			PluginPackage pluginPackage = PluginPackage.getPluginPackage(packageName);
 			List<PluginDescription> pluginDescriptionList = packageMap.get(pluginPackage);
 			if (pluginDescriptionList == null) {

Ghidra/Framework/Project/src/main/java/ghidra/framework/plugintool/util/PluginPackage.java

@@ -35,6 +35,25 @@ public abstract class PluginPackage implements ExtensionPoint, Comparable<Plugin
 
 	private static Map<String, PluginPackage> packageMap;
 
+	/**
+	 * Returns true if the system has found a plugin package for the given name
+	 * @param packageName the package name
+	 * @return true if the system has found a plugin package for the given name
+	 */
+	public static boolean exists(String packageName) {
+		if (packageMap == null) {
+			packageMap = createPackageMap();
+		}
+		PluginPackage pluginPackage = packageMap.get(packageName.toLowerCase());
+		return pluginPackage != null;
+	}
+
+	/**
+	 * Returns the existing plugin package with the given name.  If no package exists, then the
+	 * {@link MiscellaneousPluginPackage} will be returned.
+	 * @param packageName the package name
+	 * @return the package
+	 */
 	public static PluginPackage getPluginPackage(String packageName) {
 		if (packageMap == null) {
 			packageMap = createPackageMap();