Revert "Return errors instead of panic (#3782)" (#4054)

This reverts commit 985aae5575.

baseapp/baseapp.go

@@ -538,7 +538,6 @@ func (app *BaseApp) validateHeight(req abci.RequestBeginBlock) error {
 
 // BeginBlock implements the ABCI application interface.
 func (app *BaseApp) BeginBlock(req abci.RequestBeginBlock) (res abci.ResponseBeginBlock) {
-	var err error
 	if app.cms.TracingEnabled() {
 		app.cms.SetTracingContext(sdk.TraceContext(
 			map[string]interface{}{"blockHeight": req.Header.Height},
@@ -573,10 +572,7 @@ func (app *BaseApp) BeginBlock(req abci.RequestBeginBlock) (res abci.ResponseBeg
 	app.deliverState.ctx = app.deliverState.ctx.WithBlockGasMeter(gasMeter)
 
 	if app.beginBlocker != nil {
-		res, err = app.beginBlocker(app.deliverState.ctx, req)
-		if err != nil {
-			panic(err)
-		}
+		res = app.beginBlocker(app.deliverState.ctx, req)
 	}
 
 	// set the signed validators for addition to context in deliverTx
@@ -878,16 +874,12 @@ func (app *BaseApp) runTx(mode runTxMode, txBytes []byte, tx sdk.Tx) (result sdk
 
 // EndBlock implements the ABCI interface.
 func (app *BaseApp) EndBlock(req abci.RequestEndBlock) (res abci.ResponseEndBlock) {
-	var err error
 	if app.deliverState.ms.TracingEnabled() {
 		app.deliverState.ms = app.deliverState.ms.SetTracingContext(nil).(sdk.CacheMultiStore)
 	}
 
 	if app.endBlocker != nil {
-		res, err = app.endBlocker(app.deliverState.ctx, req)
-		if err != nil {
-			panic(err)
-		}
+		res = app.endBlocker(app.deliverState.ctx, req)
 	}
 
 	return