Set visibility to GONE when button is not defined

MaterialDialogDynamic/.gitignore

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+/build

MaterialDialogDynamic/build.gradle

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+apply plugin: 'com.android.library'
+apply plugin: 'maven-publish'
+
+android {
+    compileSdkVersion 31
+
+    defaultConfig {
+        minSdkVersion 19
+        targetSdkVersion 31
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    namespace 'dev.shreyaspatil.MaterialDialog.dynamic'
+
+    publishing {
+        singleVariant('release') {
+            withSourcesJar()
+        }
+    }
+}
+
+afterEvaluate {
+    publishing {
+        publications {
+            release(MavenPublication) {
+                from components.release
+                groupId = GROUP
+                artifactId = 'MaterialDialog-Dynamic'
+                version = VERSION_NAME
+            }
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation project(':MaterialDialogLibrary')
+
+    implementation 'androidx.appcompat:appcompat:1.4.0'
+    implementation 'androidx.annotation:annotation:1.3.0'
+
+    // Material Design Library
+    implementation 'com.google.android.material:material:1.4.0'
+
+    // Lottie Animation Library
+    implementation 'com.airbnb.android:lottie:4.2.2'
+
+    // Image Loading Library - only pulled in by consumers of this module
+    implementation 'com.github.bumptech.glide:glide:4.16.0'
+
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test:runner:1.4.0'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+}

MaterialDialogDynamic/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

MaterialDialogDynamic/src/main/AndroidManifest.xml

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+<manifest />