fix: handle retrieval error for weather data

src/main/python/input_backend.py

@@ -126,6 +126,12 @@ def processExternalData(datapoints, plotNameKey, fromTime, toTime, dtype, qtText
         # download date if it doesn't exist #
         url = CFG("outside_data_url").format(dtype=dtype, fromDate=fromTimeStr, toDate=toTimeStr)
         r = requests.get(url)
+
+        # check response code #
+        if r.status_code != 200 or "nicht gefunden" in r.text.lower():
+            qtTextBrowser.append(de.failed_to_retrieve.format("NOT FOUND"))
+            raise ValueError("FAILED TO RETRIEVE DATA")
+
         qtTextBrowser.append(de.pg_request.format(url))
         content = r.content.decode('utf-8', "ignore") # ignore bad bytes
 

src/main/python/localization/de.py

@@ -42,3 +42,5 @@ info_divergence     = "INFO: Seitenverhältnisabweichung zu A4: {:.2f}%"
 success             = "INFO: Fertig."
 testing_input       = "Info: Eingabedatei wird geprüft..."
 testing_input_suc   = "Info: Eingabedatei akzeptiert."
+
+failed_to_retrieve = "ERROR: Kann Wetterarchiv-Daten nicht herunterladen ({})"

src/main/python/main.py

@@ -169,20 +169,21 @@ class WidgetGallery(QDialog):
 
         # workaround for checkboxes changed #
         outsideDataNeeded = self.boxOTemp.isChecked() or self.boxOHumidity.isChecked()
+
+        # build dates #
+        try:
             self.datapoints = input_backend.read_in_file(self.srcFileString,
                                                 outsideData=outsideDataNeeded,
                                                 plotOutsideTemp=self.boxOTemp.isChecked(),
                                                 plotOutsideHum=self.boxOHumidity.isChecked(),
                                                 qtTextBrowser=self.infoTextBox)
 
-        # build dates #
-        try:
             startTimeHelper = dt.datetime.strptime(self.startTimeEdit.text(),"%H:%M")
             endTimeHelper   = dt.datetime.strptime(self.endTimeEdit.text(),"%H:%M")
         except ValueError as e:
             errorBox = QMessageBox(self)
             errorBox.setAttribute(PyQt5.QtCore.Qt.WA_DeleteOnClose)
-            errorBox.setText(self.localization.bad_time)
+            errorBox.setText(str(e))
             errorBox.setDetailedText(str(e))
             errorBox.show()
             self.buttonGo.setText(self.localization.button_go)