qmlformat: fix QFSFileEngine::open: No file name specified

Since commit d48b87450327e710f7b0a843627624aa67cae116 qmlformat
prints the message:
QFSFileEngine::open: No file name specified
on normal usage like:
qmlformat path/to/qml
qmlformat -i path/to/qml

This is because it tries to open the file specific by the
"files" option event if no such option was passed.

Change-Id: Id14247210fc77a3f10dc25866607a9952fe81dfa
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
(cherry picked from commit 45aa0853dae3f3068af08a6ed2d3248155e13e24)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 13 insertions, 11 deletions

diff --git a/tools/qmlformat/main.cpp b/tools/qmlformat/main.cpp
index da3c1772fb..3f11ce257a 100644
--- a/tools/qmlformat/main.cpp
+++ b/tools/qmlformat/main.cpp
@@ -224,17 +224,19 @@ Options buildCommandLineOptions(const QCoreApplication &app)
     }
 
     QStringList files;
-    QFile file(parser.value("files"));
-    file.open(QIODevice::Text | QIODevice::ReadOnly);
-    if (file.isOpen()) {
-        QTextStream in(&file);
-        while (!in.atEnd()) {
-            QString file = in.readLine();
-
-            if (file.isEmpty())
-                continue;
-
-            files.push_back(file);
+    if (parser.isSet("files")) {
+        QFile file(parser.value("files"));
+        file.open(QIODevice::Text | QIODevice::ReadOnly);
+        if (file.isOpen()) {
+            QTextStream in(&file);
+            while (!in.atEnd()) {
+                QString file = in.readLine();
+
+                if (file.isEmpty())
+                    continue;
+
+                files.push_back(file);
+            }
         }
     }