fix issue where pressing a number or an operator after the following …

…sequence throws an exception:

1 / 0 =

Pressing a number after the above sequence should replace the `=` sign with the number or operator, e.g.

(A) `1 / 0 / =`

Press `2` after sequence (A)
`1 / 0 / 2`

Press `+` after sequence (A)
`1 / 0 +`

The library will still call a CalculatorUpdate of`DivideByZeroException` in this case that the library user can handle

build.gradle

@@ -8,7 +8,7 @@ plugins {
      * Use plugin 'kotlin' if importing this project into Android Studio
      * Use plugin 'org.jetbrains.kotlin.jvm' version '1.3.61' to build library
      */
-//    id 'kotlin'
+    //id 'kotlin'
     id 'org.jetbrains.kotlin.jvm' version '1.4.10'
 }
 
@@ -19,7 +19,7 @@ allprojects {
 }
 
 group 'com.github.jairrab.calc'
-version "3.1.0"
+version "3.1.1"
 
 
 java {

src/main/kotlin/com/github/jairrab/calc/lib/controls/outputs/DisplayManager.kt

@@ -42,6 +42,10 @@ class DisplayManager private constructor(
         } catch (e: DivideByZeroException) {
             LOG.warning("Divide by zero error")
             listener?.onCalculatorUpdate(Error.DivideByZero(button.tag, entries))
+
+            if (button == CalculatorButton.EQUALS) {
+                entriesManager.removeLastEntry()
+            }
         }
     }