Add and refine debug log messages (#625)

Since these are going to be visible to the user now, at least let's properly format them and make them somewhat helpful.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/text_file_functions.cpp b/src/text_file_functions.cpp
index 6ea82f59..46e7511e 100644
--- a/src/text_file_functions.cpp
+++ b/src/text_file_functions.cpp
@@ -164,11 +164,14 @@ QStringList AOApplication::get_list_file(QString p_file)
 
 QString AOApplication::read_file(QString filename)
 {
+  if (filename.isEmpty())
+    return QString();
+
   QFile f_log(filename);
 
   if (!f_log.open(QIODevice::ReadOnly | QIODevice::Text)) {
-    qWarning() << "Couldn't open" << filename;
-    return "";
+    qWarning() << "Couldn't open" << filename << "for reading";
+    return QString();
   }
 
   QTextStream in(&f_log);