return empty list of instruments if no image detected

Author: dernasherbrezon

src/main/java/ru/r2cloud/model/Observation.java

@@ -357,7 +357,9 @@ public static Observation fromJson(JsonObject meta) {
 				}
 				instrumentsObj.add(cur);
 			}
-			result.setInstruments(instrumentsObj);
+			if (!instrumentsObj.isEmpty()) {
+				result.setInstruments(instrumentsObj);
+			}
 		}
 		return result;
 	}
@@ -408,7 +410,7 @@ public JsonObject toJson(SignedURL signed) {
 		if (device != null) {
 			json.add("device", device.toJson());
 		}
-		if (getInstruments() != null) {
+		if (getInstruments() != null && !getInstruments().isEmpty()) {
 			JsonArray instrumentsArray = new JsonArray();
 			for (Instrument cur : getInstruments()) {
 				instrumentsArray.add(cur.toJson(signed));

src/main/java/ru/r2cloud/satellite/decoder/FoxDecoder.java

@@ -96,6 +96,9 @@ protected List<Instrument> decodeImage(Satellite satellite, List<? extends Beaco
 			}
 			series.add(imageFile);
 		}
+		if (series.isEmpty()) {
+			return Collections.emptyList();
+		}
 		Instrument result = new Instrument(camera);
 		result.setImageSeries(series);
 		return Collections.singletonList(result);

src/main/java/ru/r2cloud/satellite/decoder/GaspacsDecoder.java

@@ -54,6 +54,9 @@ protected List<Instrument> decodeImage(Satellite satellite, List<? extends Beaco
 			}
 			series.add(imageFile);
 		}
+		if (series.isEmpty()) {
+			return Collections.emptyList();
+		}
 		Instrument result = new Instrument(camera);
 		result.setImageSeries(series);
 		return Collections.singletonList(result);

src/main/java/ru/r2cloud/satellite/decoder/Geoscan2Decoder.java

@@ -50,6 +50,9 @@ protected List<Instrument> decodeImage(Satellite satellite, List<? extends Beaco
 			}
 			series.add(imageFile);
 		}
+		if (series.isEmpty()) {
+			return Collections.emptyList();
+		}
 		Instrument result = new Instrument(camera);
 		result.setImageSeries(series);
 		return Collections.singletonList(result);

src/main/java/ru/r2cloud/satellite/decoder/Jy1satDecoder.java

@@ -46,6 +46,9 @@ protected List<Instrument> decodeImage(Satellite satellite, List<? extends Beaco
 			}
 			series.add(imageFile);
 		}
+		if (series.isEmpty()) {
+			return Collections.emptyList();
+		}
 		Instrument result = new Instrument(camera);
 		result.setImageSeries(series);
 		return Collections.singletonList(result);

src/main/java/ru/r2cloud/satellite/decoder/Lucky7Decoder.java

@@ -47,6 +47,9 @@ protected List<Instrument> decodeImage(Satellite satellite, List<? extends Beaco
 			}
 			series.add(imageFile);
 		}
+		if (series.isEmpty()) {
+			return Collections.emptyList();
+		}
 		Instrument result = new Instrument(camera);
 		result.setImageSeries(series);
 		return Collections.singletonList(result);

src/main/java/ru/r2cloud/satellite/decoder/RoseyDecoder.java

@@ -41,6 +41,9 @@ protected List<Instrument> decodeImage(Satellite satellite, List<? extends Beaco
 			}
 			series.add(imageFile);
 		}
+		if (series.isEmpty()) {
+			return Collections.emptyList();
+		}
 		Instrument result = new Instrument(camera);
 		result.setImageSeries(series);
 		return Collections.singletonList(result);

src/main/java/ru/r2cloud/satellite/decoder/Sharjahsat1Decoder.java

@@ -41,6 +41,9 @@ protected List<Instrument> decodeImage(Satellite satellite, List<? extends Beaco
 			}
 			series.add(imageFile);
 		}
+		if (series.isEmpty()) {
+			return Collections.emptyList();
+		}
 		Instrument result = new Instrument(camera);
 		result.setImageSeries(series);
 		return Collections.singletonList(result);

src/main/java/ru/r2cloud/satellite/decoder/SputnixDecoder.java

@@ -41,6 +41,9 @@ protected List<Instrument> decodeImage(Satellite satellite, List<? extends Beaco
 			}
 			series.add(imageFile);
 		}
+		if (series.isEmpty()) {
+			return Collections.emptyList();
+		}
 		Instrument result = new Instrument(camera);
 		result.setImageSeries(series);
 		return Collections.singletonList(result);

src/main/java/ru/r2cloud/satellite/decoder/StratosatTk1Decoder.java

@@ -45,6 +45,9 @@ protected List<Instrument> decodeImage(Satellite satellite, List<? extends Beaco
 			}
 			series.add(imageFile);
 		}
+		if (series.isEmpty()) {
+			return Collections.emptyList();
+		}
 		Instrument result = new Instrument(camera);
 		result.setImageSeries(series);
 		return Collections.singletonList(result);