suppress -splash option if no splash image is specified in Info.plist // fixes tofi86#94

Author: tofi86

src/universalJavaApplicationStub

@@ -11,7 +11,7 @@
 #                                                                                #
 # @author    Tobias Fischer                                                      #
 # @url       https://github.com/tofi86/universalJavaApplicationStub              #
-# @date      2020-08-30                                                          #
+# @date      2021-01-06                                                          #
 # @version   3.1.0-beta                                                          #
 #                                                                                #
 ##################################################################################
@@ -810,10 +810,10 @@ stub_logger "[WorkingDirectory] ${WorkingDirectory}"
 # - main class
 # - main class arguments
 # - passthrough arguments from Terminal or Drag'n'Drop to Finder icon
-stub_logger "[Exec] \"$JAVACMD\" -cp \"${JVMClassPath}\" -splash:\"${ResourcesFolder}/${JVMSplashFile}\" -Xdock:icon=\"${ResourcesFolder}/${CFBundleIconFile}\" -Xdock:name=\"${CFBundleName}\" ${JVMOptionsArr:+$(printf "'%s' " "${JVMOptionsArr[@]}") }${JVMDefaultOptions:+$JVMDefaultOptions }${JVMMainClass}${MainArgsArr:+ $(printf "'%s' " "${MainArgsArr[@]}")}${ArgsPassthru:+ $(printf "'%s' " "${ArgsPassthru[@]}")}"
+stub_logger "[Exec] \"$JAVACMD\" -cp \"${JVMClassPath}\" ${JVMSplashFile:+ -splash:\"${ResourcesFolder}/${JVMSplashFile}\"} -Xdock:icon=\"${ResourcesFolder}/${CFBundleIconFile}\" -Xdock:name=\"${CFBundleName}\" ${JVMOptionsArr:+$(printf "'%s' " "${JVMOptionsArr[@]}") }${JVMDefaultOptions:+$JVMDefaultOptions }${JVMMainClass}${MainArgsArr:+ $(printf "'%s' " "${MainArgsArr[@]}")}${ArgsPassthru:+ $(printf "'%s' " "${ArgsPassthru[@]}")}"
 exec "${JAVACMD}" \
 		-cp "${JVMClassPath}" \
-		-splash:"${ResourcesFolder}/${JVMSplashFile}" \
+		${JVMSplashFile:+ -splash:"${ResourcesFolder}/${JVMSplashFile}"} \
 		-Xdock:icon="${ResourcesFolder}/${CFBundleIconFile}" \
 		-Xdock:name="${CFBundleName}" \
 		${JVMOptionsArr:+"${JVMOptionsArr[@]}" }\