Fix bad 'SoapySDR missing' modal dialog thread call

src/forms/SDRDevices/SDRDevices.cpp

@@ -7,6 +7,7 @@
 
 SDRDevicesDialog::SDRDevicesDialog( wxWindow* parent ): devFrame( parent ) {
     refresh = true;
+    failed = false;
     m_addRemoteButton->Disable();
     m_useSelectedButton->Disable();
     m_deviceTimer.Start(250);
@@ -229,6 +230,16 @@ void SDRDevicesDialog::OnTreeDoubleClick( wxMouseEvent& event ) {
 
 void SDRDevicesDialog::OnDeviceTimer( wxTimerEvent& event ) {
     if (refresh) {
+        if (wxGetApp().areModulesMissing()) {
+            if (!failed) {
+                wxMessageDialog *info;
+                info = new wxMessageDialog(NULL, wxT("\nNo SoapySDR modules were found.\n\nCubicSDR requires at least one SoapySDR device support module to be installed.\n\nPlease visit https://github.com/cjcliffe/CubicSDR/wiki and in the build instructions for your platform read the 'Support Modules' section for more information."), wxT("\x28\u256F\xB0\u25A1\xB0\uFF09\u256F\uFE35\x20\u253B\u2501\u253B"), wxOK | wxICON_ERROR);
+                info->ShowModal();
+                failed = true;
+            }
+            return;
+        }
+        
         if (wxGetApp().areDevicesEnumerating() || !wxGetApp().areDevicesReady()) {
             std::string msg = wxGetApp().getNotification();
             devStatusBar->SetStatusText(msg);
@@ -237,7 +248,7 @@ void SDRDevicesDialog::OnDeviceTimer( wxTimerEvent& event ) {
             event.Skip();
             return;
         }
-        
+                
         devTree->DeleteAllItems();
         
         wxTreeItemId devRoot = devTree->AddRoot("Devices");

src/forms/SDRDevices/SDRDevices.h

@@ -23,7 +23,7 @@ private:
     SDRDeviceInfo *getSelectedDevice(wxTreeItemId selId);
     wxPGProperty *addArgInfoProperty(wxPropertyGrid *pg, SoapySDR::ArgInfo arg);
 
-    bool refresh;
+    bool refresh, failed;
     std::map<std::string, std::vector<SDRDeviceInfo *>* > devs;
     std::vector<SDRDeviceInfo *>::iterator devs_i;
     std::map<wxTreeItemId, SDRDeviceInfo *> devItems;