Fixed: crash when importing from GnuCash file with budgets

Author: codinguser

app/src/main/java/org/gnucash/android/importer/GncXmlHandler.java

@@ -555,7 +555,8 @@ public void endElement(String uri, String localName, String qualifiedName) throw
                 try {
                     PeriodType periodType = PeriodType.valueOf(characterString.toUpperCase());
                     periodType.setMultiplier(mRecurrenceMultiplier);
-                    mScheduledAction.setPeriod(periodType);
+                    if (mScheduledAction != null) //there might be recurrence tags for bugdets and other stuff
+                        mScheduledAction.setPeriod(periodType);
                 } catch (IllegalArgumentException ex){ //the period type constant is not supported
                     String msg = "Unsupported period constant: " + characterString;
                     Log.e(LOG_TAG, msg);