Catch IllegalArgumentException from URI.toURL(). Resolves #547.

Author: bengtmartensson

src/main/java/org/harctoolbox/irscrutinizer/importer/ReaderImporter.java

@@ -84,7 +84,7 @@ public void load(String urlOrFilename, boolean zip, String charsetName) throws I
 
         try {
            loadURL(urlOrFilename, charsetName);
-        } catch (URISyntaxException | InvalidArgumentException ex) {
+        } catch (URISyntaxException | InvalidArgumentException | IllegalArgumentException ex) {
             if (zip)
                 possiblyZipLoad(new File(urlOrFilename), charsetName);
             else