Prevent enable replay when no sample is selected

SpectrumAWG/blacs_tabs.py

@@ -63,10 +63,11 @@ class SpectrumAWGTab(DeviceTab):
     @define_state(MODE_MANUAL,False)
     def manual_memory_replay(self):
         if not self.manual_active:
-            index = self.ui.comboBox_memory.currentIndex() 
-            self.ui.pushButton_MemoryReplay.setIcon(self.stop_icon)
-            self.ui.pushButton_SingleTone.setEnabled(False)
-            self.manual_active = True
+            index = self.ui.comboBox_memory.currentIndex()
+            if index!=-1:
+                self.ui.pushButton_MemoryReplay.setIcon(self.stop_icon)
+                self.ui.pushButton_SingleTone.setEnabled(False)
+                self.manual_active = True
             yield(self.queue_work(self._primary_worker,'program_manual',index))
         else:
             self.ui.pushButton_MemoryReplay.setIcon(self.start_icon)
@@ -79,5 +80,5 @@ class SpectrumAWGTab(DeviceTab):
         self.ui.comboBox_memory.clear()
         for memory_index,instruction in self._final_values.items():
             self.ui.comboBox_memory.addItem(f"{memory_index} {instruction}")
-        self.ui.comboBox_memory.view().setMinimumWidth(self.ui.comboBox_memory.view().sizeHintForColumn(0))
+        self.ui.comboBox_memory.view().setMinimumWidth(self.ui.comboBox_memory.view().sizeHintForColumn(0)+30)
         
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