clearPositiveIntValue method Null safety

1. spine_client
2. descriptor.pb
3. UninterpretedOption
4. clearPositiveIntValue method

UninterpretedOption class

1. Constructors
2. UninterpretedOption
3. fromBuffer
4. fromJson
5. Properties
6. aggregateValue
7. doubleValue
8. eventPlugin
9. hashCode
10. identifierValue
11. info_
12. isFrozen
13. name
14. negativeIntValue
15. positiveIntValue
16. runtimeType
17. stringValue
18. unknownFields
19. Methods
20. $_ensure
21. $_get
22. $_getB
23. $_getBF
24. $_getI
25. $_getI64
26. $_getIZ
27. $_getList
28. $_getMap
29. $_getN
30. $_getS
31. $_getSZ
32. $_has
33. $_setBool
34. $_setBytes
35. $_setDouble
36. $_setFloat
37. $_setInt64
38. $_setSignedInt32
39. $_setString
40. $_setUnsignedInt32
41. $_whichOneof
42. addExtension
43. check
44. clear
45. clearAggregateValue
46. clearDoubleValue
47. clearExtension
48. clearField
49. clearIdentifierValue
50. clearNegativeIntValue
51. clearPositiveIntValue
52. clearStringValue
53. clone
54. copyWith
55. createEmptyInstance
56. createMapField
57. createRepeatedField
58. extensionsAreInitialized
59. freeze
60. getDefaultForField
61. getExtension
62. getField
63. getFieldOrNull
64. getTagNumber
65. hasAggregateValue
66. hasDoubleValue
67. hasExtension
68. hasField
69. hasIdentifierValue
70. hasNegativeIntValue
71. hasPositiveIntValue
72. hasRequiredFields
73. hasStringValue
74. isInitialized
75. mergeFromBuffer
76. mergeFromCodedBufferReader
77. mergeFromJson
78. mergeFromJsonMap
79. mergeFromMessage
80. mergeFromProto3Json
81. mergeUnknownFields
82. noSuchMethod
83. setExtension
84. setField
85. toBuilder
86. toDebugString
87. toProto3Json
88. toString
89. writeToBuffer
90. writeToCodedBufferWriter
91. writeToJson
92. writeToJsonMap
93. Operators
94. operator ==
95. Static methods
96. create
97. createRepeated
98. getDefault