Fixed bug in FileIssue constructor

libpit/src/com/jdbernard/pit/FileIssue.groovy

@@ -11,7 +11,9 @@ public class FileIssue extends Issue {
         super('REPLACE_ME')
 
         def matcher = file.name =~ /(\d{4})([bftc])(\d).*/
-        if (!matcher) return null
+        if (!matcher)
+            throw new IllegalArgumentException("${file} " +
+                "is not a valid Issue file.")
 
         super.@id = matcher[0][1]
         super.@category = Category.toCategory(matcher[0][2])

libpit/src/com/jdbernard/pit/FileProject.groovy

@@ -21,7 +21,8 @@ class FileProject extends Project {
 
                 // otherwise build and add to list
                 projects[(child.name)] =  new FileProject(child)
-            } else if (child.isFile()) {
+            } else if (child.isFile() &&
+                       FileIssue.isValidFilename(child.name)) {
                 def issue
                 
                 // if exception, then not an issue