core: print error on failed method decode

jadx-core/src/main/java/jadx/core/codegen/MethodGen.java

@@ -180,14 +180,19 @@ public class MethodGen {
 
 	public void addFallbackMethodCode(CodeWriter code) {
 		if (mth.getInstructions() == null) {
-			// load original instructions
-			try {
-				mth.load();
-				DepthTraversal.visit(new FallbackModeVisitor(), mth);
-			} catch (DecodeException e) {
-				LOG.error("Error reload instructions in fallback mode:", e);
-				code.startLine("// Can't loadFile method instructions: " + e.getMessage());
-				return;
+			JadxErrorAttr errorAttr = mth.get(AType.JADX_ERROR);
+			if (errorAttr == null
+					|| errorAttr.getCause() == null
+					|| !errorAttr.getCause().getClass().equals(DecodeException.class)) {
+				// load original instructions
+				try {
+					mth.load();
+					DepthTraversal.visit(new FallbackModeVisitor(), mth);
+				} catch (DecodeException e) {
+					LOG.error("Error reload instructions in fallback mode:", e);
+					code.startLine("// Can't load method instructions: " + e.getMessage());
+					return;
+				}
 			}
 		}
 		InsnNode[] insnArr = mth.getInstructions();

jadx-core/src/main/java/jadx/core/dex/nodes/ClassNode.java

@@ -222,8 +222,8 @@ public class ClassNode extends LineAttrNode implements ILoadable {
 		for (MethodNode mth : getMethods()) {
 			try {
 				mth.load();
-			} catch (DecodeException e) {
-				LOG.error("Method load error", e);
+			} catch (Exception e) {
+				LOG.error("Method load error:", e);
 				mth.addAttr(new JadxErrorAttr(e));
 			}
 		}

jadx-core/src/main/java/jadx/core/dex/visitors/ClassModifier.java

@@ -156,7 +156,8 @@ public class ClassModifier extends AbstractVisitor {
 			// remove public empty constructors
 			if (af.isConstructor()
 					&& af.isPublic()
-					&& mth.getArguments(false).isEmpty()) {
+					&& mth.getArguments(false).isEmpty()
+					&& !mth.contains(AType.JADX_ERROR)) {
 				List<BlockNode> bb = mth.getBasicBlocks();
 				if (bb == null || bb.isEmpty() || allBlocksEmpty(bb)) {
 					mth.add(AFlag.DONT_GENERATE);