Missing HazMap.cs

Forgot this file and lost the work I had done on it.
So redone it and a few more changes.
* Fixes crash on save dialog cancel
* Removed my failed crash prevention from
clipboardToolStripMenuItem_Click() (was moved to readscan.cs)
* Moved openfilediag() up other openToolStripMenuItem_Click()
* Added same check to textFileToolStripMenuItem_Click() as I did for
clipboardToolStripMenuItem_Click()

HazMap.cs

@@ -250,8 +250,11 @@ public Point sides_ab(int hypotinuse, int angle_A, bool radians = true )
 
         private void saveToolStripMenuItem_Click(object sender, EventArgs e)
         {
-            string filename = savefilediag(".hzm");           
-            filehandling.SerializeObject(galaxy, filename);
+            string filename = savefilediag(".hzm");
+            if (filename != null)
+            {
+                filehandling.SerializeObject(galaxy, filename);
+            }
         }
 
         private string savefilediag(string extension)
@@ -260,8 +263,8 @@ private string savefilediag(string extension)
             sfd.AddExtension = true;
             sfd.DefaultExt = extension;
             string filename = null;
-            DialogResult ofd_result = sfd.ShowDialog();
-            if (ofd_result == DialogResult.OK)
+            DialogResult sfd_result = sfd.ShowDialog();
+            if (sfd_result == DialogResult.OK)
             {
                 filename = sfd.FileName;
             }
@@ -278,17 +281,39 @@ private void openToolStripMenuItem_Click(object sender, EventArgs e)
             }
         }
 
+        private string openfilediag(string extension)
+        {
+            OpenFileDialog ofd = new OpenFileDialog();
+            //ofd.Filter = "*" + extension;
+            ofd.DefaultExt = extension;
+            string filename = null;
+            DialogResult ofd_result = ofd.ShowDialog();
+            if (ofd_result == DialogResult.OK)
+            {
+                filename = ofd.FileName;
+            }
+            return filename;
+        }
+
         private void clipboardToolStripMenuItem_Click(object sender, EventArgs e)
         {
             string hazscan = Clipboard.GetText();
-            string pastemesage = Readscan.readscan(hazscan, galaxy);
-            if (pastemesage != null)
+            // There has to be "System Survey of " in the clipboard, or else it isn't a scan report.
+            if (hazscan != null && hazscan.Contains("System Survey of "))
             {
-                this.toolStripStatusLabel1.Text = pastemesage;
+                string pastemesage = Readscan.readscan(hazscan, galaxy);
+                if (pastemesage != null)
+                {
+                    this.toolStripStatusLabel1.Text = pastemesage;
+                }
+                else
+                {
+                    this.toolStripStatusLabel1.Text = "Paste failed";
+                }
             }
             else
             {
-                this.toolStripStatusLabel1.Text = "Paste failed";
+                this.toolStripStatusLabel1.Text = "Paste invalid";
             }
         }
 
@@ -299,27 +324,21 @@ private void textFileToolStripMenuItem_Click(object sender, EventArgs e)
             try
             {
                 string scantext = File.ReadAllText(scanfile);
-                Readscan.readscan(scantext, galaxy);
+                if (scantext.Contains("System Survey of "))
+                {
+                    Readscan.readscan(scantext, galaxy);
+                }
+                else
+                {
+                    this.toolStripStatusLabel1.Text = "Text file invalid";
+                }
             }
             catch (IOException)
             {
+                this.toolStripStatusLabel1.Text = "Text file read error";
             }
         }
 
-        private string openfilediag(string extension)
-        {
-            OpenFileDialog ofd = new OpenFileDialog();
-            //ofd.Filter = "*" + extension;
-            ofd.DefaultExt = extension;
-            string filename = null;
-            DialogResult ofd_result = ofd.ShowDialog();
-            if (ofd_result == DialogResult.OK)
-            {
-                filename = ofd.FileName;
-            }
-            return filename;
-        }
-
         private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
         {
             if (e.Button == MouseButtons.Left)