[FIX](NPE PentahoRepositoryAccess#getRepositoryFile) Method didn't te…

…st if the Pentaho solution repository returned a null ISolutionFile.

It wrapped the null anyway.
Later, calling the returned IRepositoryFile's methods caused NPEs.

cpf-pentaho/src/pt/webdetails/cpf/repository/PentahoRepositoryAccess.java

@@ -329,7 +329,8 @@ public void setUserSession(IUserSession userSession) {
 
   @Override
   public IRepositoryFile getRepositoryFile(String path, FileAccess fileAccess) {
-    return new PentahoRepositoryFile(getSolutionRepository().getSolutionFile(path, fileAccess.ordinal()));
+	ISolutionFile file = getSolutionRepository().getSolutionFile(path, fileAccess.ordinal());
+    return file != null ? new PentahoRepositoryFile(file) : null;
   }