Fixed crash when batch converting

Will clean later.

app/src/main/java/com/sadellie/unitto/screens/main/MainViewModel.kt

@@ -500,7 +500,13 @@ class MainViewModel @Inject constructor(
     /**
      * Returns value to be used when converting value on the right side screen (unit selection)
      */
-    fun inputValue() = (mainFlow.value.calculatedValue ?: mainFlow.value.inputValue).toBigDecimal()
+    fun inputValue(): BigDecimal? {
+        return try {
+            (mainFlow.value.calculatedValue ?: mainFlow.value.inputValue).toBigDecimal()
+        } catch (e: NumberFormatException) {
+            null
+        }
+    }
 
     /**
      * Returns True if can be placed.

app/src/main/java/com/sadellie/unitto/screens/second/SecondScreen.kt

@@ -174,7 +174,7 @@ fun RightSideScreen(
     navigateUp: () -> Unit,
     navigateToSettingsAction: () -> Unit,
     selectAction: (AbstractUnit) -> Unit,
-    inputValue: BigDecimal,
+    inputValue: BigDecimal?,
     unitFrom: AbstractUnit
 ) {
     val uiState = viewModel.mainFlow.collectAsStateWithLifecycle()
@@ -225,9 +225,11 @@ fun RightSideScreen(
                                 },
                                 favoriteAction = { viewModel.favoriteUnit(it) },
                                 convertValue = {
-                                    Formatter.format(
-                                        unitFrom.convert(unit, inputValue, 3).toPlainString()
-                                    )
+                                    inputValue?.let {
+                                        Formatter.format(
+                                            unitFrom.convert(unit, it, 3).toPlainString()
+                                        ) + " "
+                                    } ?: ""
                                 }
                             )
                         }

app/src/main/java/com/sadellie/unitto/screens/second/components/UnitListItem.kt

@@ -183,5 +183,5 @@ fun UnitListItem(
     isSelected = isSelected,
     selectAction = selectAction,
     favoriteAction = favoriteAction,
-    shortNameLabel = "${convertValue(unit)} ${stringResource(unit.shortName)}"
+    shortNameLabel = "${convertValue(unit)}${stringResource(unit.shortName)}"
 )